Used Werner truck- buy or run away?

I posted this over in the Werner section, but later thought I'd get more responses here since there are more O/O here. I was looking at a couple of used 379's my local dealer got in and found out they are ex Werner trucks. Here is what I found out on one of them. It's an '06 379 with C15@435/1750 with a 13spd and 418k. I ran the engine number through Cat and there were only a couplle of minor claims on the engine: one for an oil leak and one for an oil line. The dealer was closed, but the truck was unlocked so I climbed in to see how the trans shifted, it moved through the gears really smooth without any binding, clutch also felt good. So my questions are:

1. is the engine able to be turned up by a simple ecm flash to 475-500hp
2. Will any Cat service center be able to deactivated any of the "nanny" programs that most of these company trucks have? I know Werner has a idle timer and speed is governed to I believe 65.
3. I've heard that the low mileage Werner trucks that are for sale are wreaked trucks, any truth to this and if so,would a 5yr old truck with 418k be one of these trucks?
4. How is Werners maintinance program?
5. Should I just run away since it's one of their trucks?

The dealer that has the truck has it done up really nice with eight new virgin drives, freshly polished wheel/tanks, and all new brakes. The only downside is the paint is a little faded and I can still make out the Werner graphics on the side, and the top of the hood is a little oxidized.

 

Asking price on their site is $61,500, But I'm sure a guy could get it a little cheaper. Wicks in Omaha has about 30 of these also and they want $71,900 for ones with similar miles.

 

I checked the truck over pretty good and it doesn't appear to have any body work done to it. The truck sat normal, frame looked straight and the paint matched over the entire body(other than where the decals were). The frame also appeared to have original paint on it and had a normal amount of rust starting to show up for a truck that has been on the road for 5yrs.

 

I kinda figured this truck would be exempt from the wreaked/rebuilt group but just wanted to make sure. I actually have enough to pay for the truck, but will probably put it on a three year loan so as not to deplete my excess funds just in case I would run into problems. If there is no big problems after a year I will probably pay the truck off.

I know alot of people that run Cat's and they all say to be prepaired to do an OH around 700-800k. I'm still looking for a lower mileage truck to show up, but finding one spec'd like I want and pre DPF is getting harder.