Trailer direct connect to truck batteries.

Shouldn't be a problem. Check how many amps the trailer draws when hydraulics/winch is being used (shouldnt be an issue with the high output alternator). Just make sure you don't have any parasitic drains on your trailer more than anything. It isn't any different than hooking up a winch or hydraulic pump on your truck, but the extra length of the leads will require some heavy wires.

 

If you're getting rid of the truck batteries completely then be absolutely sure that connector can handle the amps of the starter without a problem.

 

I think he's removing the trailer batteries instead of his truck batteries. That plug he has pictured is a 12 volt quick connect. He just needs to get some 2 or 4 gauge wires (same as whatever is on the trailer) and the male plug that matches the trailers female.

 

Also make sure your trailer still has a small breakaway battery. I've seen on some with lager 12 volts they will omit the little breakaway & just power it off the winch battery. Without a functioning breakaway, you will fail level 2 & 3 inspections..

How much weight on the drive is this actually going to save you?
Is 80-90lbs really worth all this? Just asking..

Contact Texas Pride & see what they think about this idea. IMHO, that is just a charging wire. Possibly not large enough to completely support the deck operation. I also think you may prematurely stress out the trucks starting batteries. They are cranking, not deep cycle & you need them both to roll over that cummins.

 

Standard gas truck has one battery. All cummins powered Rams have come with 2 batteries since 1994. Unhook one of your batteries ground cables & try to start it. It won't..

I would think it wise though to get that opinion. That why I mentioned TP. I really don't know for sure. Just throwing out things I'd consider..

 

Sometimes a salesman will make stuff up as they go to make something sound more enticing.? You never know..

The bigger alternator will help, but I'd bet the trailer must have a pretty big current draw in order for the manufacturer to spec it with 2 deep cycle batteries. Just do as you were thinking & get a professional opinion. I may just be being overly cautious..