trailer doors double swing out / roll up

Discussion in 'Questions To Truckers From The General Public' started by KaneCounty, Sep 29, 2010.

  1. KaneCounty

    KaneCounty Bobtail Member

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    Sep 29, 2010
    Kanab, Utah
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    I have a few questions regarding rear doors on trailers and trailers in general...just curious things I have noticed through the years.

    1. double doors that swing out vs. single roll up door: I was near a major hotel loading dock in Las Vegas and trucks were constantly coming and going. One truck while backing up had one of the double doors swing loose from the open position as he backed down the slight decline into the dock...bent the door all to heck when it hit the dock before the trailer did. Then another driver got backed up to the dock and then realized he did not have his double doors open and had to pull forward, open the doors and then back up again. Would not a single roll up door prevent these types of things from happening?

    2. polished metal doors vs. painted doors: Is there a reason/benefit with one over the other?

    3. advertising on trailers: With the popularity of cars being "wrapped" in advertising these days I am surprised I do not see trailers "wrapped". With a tremendous amount eyes watching you on the road it seems like an easy money maker for a driver. Anyone remember years ago when trucks in Utah had the trailer painted with scenes of National Parks located in Utah...Zion and Bryce?

    4. raw milk getting warm in transport: I saw dairy tankers going from Delta, Utah to Las Vegas, it has to be 275 miles with the last 125 miles in 100+ degree heat all summer. How does the milk stay at the proper temperature? I do not see any type of refrigeration on the tanker.

    Thanking you in advance,
    Kane County
     
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  3. Rerun8963

    Rerun8963 Road Train Member

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    YES, and so would checking the mirrors on BOTH sides........this is driver error.

    YES. polished doors help drivers, when especially at night, some jerk 4 wheeler has his bright lights (high beams)on.......the light reflects off the polished doors, and blinds the 4 wheeler. then he crashes and burns and hopefully dies..............

    many companies do "'sell" advertising space. but it IS time consuming, especially if and when the sign that is posted, needs to be cleaned up or touched up/repaired. now you have a trailer that can't go no where's.

    this i do not know............i cannot drink milk.........so i don't really think about it, and probably never will either.
     
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  4. Allow Me.

    Allow Me. Trucker Forum STAFF Staff Member

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    With roll-up doors, you lose some available space (the area between the rolled up door and the roof.) A lot of local LTL freight jocks do use roll up doors, which are convenient for 30 stop days. Also, some freight docks are very dark, like backing into a cave when the sun is shining bright, so the driver has to be very cautious. As to the milk hauler, was he actually hauling milk? Was he empty? You know, milk is not refrigerated until it is processed and pasteurized ( which is heating), but I never hauled milk so I can't say for sure.
     
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  5. 25(2)+2

    25(2)+2 Trucker Forum STAFF Staff Member

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    I'll take the milk one, raw milk can be held colder than 40 degrees and must be above freezing, longer hauls are run through a plate cooler before or while loading to chill it more, and the tankers are insulated.

    Some things are hauled hot on insulated tankers. These are Haz-Mat because of the temperature.
     
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  6. Lastkidpicked

    Lastkidpicked Medium Load Member

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    Hello, 25, thanks for answering the milk tank question.

    You will see a D-ring on each door and a hook on the side of the trailer to hold the doors open. I don't know why his door came open. The single roll up door takes up room on top when it's opened and careless forklift drivers can hit that door while its opened and damage it.

    Those doors take a lot of abuse, and stainless steel holds up better than painted wood.

    Remember that you don't know all the places these trailers will go. Some towns might consider this a rolling sign and require you to get a sign permit. Imagine doing THAT in every town you roll thru.

    I agree with 25 on this one, and will add to it: Tankers have a "sandwich" of insulation between the outer shell and the inner shell. Best practices also state that you should fill the tank full, because it takes a LOT of energy to raise the temperature of 7000 gallons of liquid.

    You're welcome, and welcome to the forums.
     
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  7. KaneCounty

    KaneCounty Bobtail Member

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    Sep 29, 2010
    Kanab, Utah
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    Thank you for the explanations...makes perfect sense!

    As to the milk hauler(s), excellent point about pasteurized/processed. I assumed they were loaded but not sure...I see them occasionally, 2 trucks running together pretty trucks (white w/ purple fenders) Southbound slowly through the Virgin River Gorge. Then about 5 hours later Northbound in about the same place passing me going up hill.
     
  8. notarps4me

    notarps4me Road Train Member

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    Roll up doors can be damaged by fork trucks. Back when I peddled boxes; a lot of the drops were in tight places off of busy streets. Having to get out and open the doors created more of a time delay for holding up traffic. Also in some of those places pulling out was a pain because there was often no room to close the doors until you were in traffic. Sometimes the trailer would be in a lean causing the doors not to close right and you would have to pull up again and then get back out of the truck in traffic again.

    Sometimes the D ring is broken or the chain is gone and someone has put a wire or makeshift device to hold the door open. Some trailers did not use D rings. Instead they had a bar that was spring loaded that held the door open.
     
  9. Flying Dutchman

    Flying Dutchman Road Train Member

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    Being from California....I'm going to say that I have seen trailers vandalized, and severely damaged because a certain gang did not like what was advertised. You might think "what the heck could be so offensive about something as simple as this?" and trust me, it should be nothing, but that will not stop some of the crazies out here. Some drivers may not want the responsibility.
     
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  10. KaneCounty

    KaneCounty Bobtail Member

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    Sep 29, 2010
    Kanab, Utah
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    Flying Dutchman said.... "I'm going to say that I have seen trailers vandalized, and severely damaged because a certain gang did not like what was advertised. You might think "what the heck could be so offensive about something as simple as this?" and trust me, it should be nothing, but that will not stop some of the crazies out here. Some drivers may not want the responsibility."

    WOW! That would not have occurred to me in a million years. What the heck are some people thinking these days!
     
  11. Injun

    Injun Road Train Member

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    West o' the Big Crick
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    As for damaging the door that swung loose while the driver was backing: I have learned you don't trust those chain moorings because all you need is a good wind to blow your door against the side of the trailer or to hit a decent size bump...or just back down an incline...and those chains will lose their tension and fall off those hooks. Then you have a free swinging door just looking for something to hit.

    Solution: hook a bungee cord to the chain and stretch it back to the slider rail, hook it there. Don't do this until after you've slid your tandems, if that's what the customer wants. I've never had this method fail.
     
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