They are nice trucks, but wait a few years before you sing praises about them, the wiring system is not well protected at all, and I'm running into issues regularly with transmission control and ABS sensors/controls, usually attributed to wiring rubbed thru/chaffed.
The AC system while it works REALLY well, is prone to the air box ( on top of the engine ) rubbing holes in the lines right at the compressor, as well as lines rubbing together at the rad. support on pass side.
The brakes are great (4 piston fixed up front (make 'yota calipers look really small) , dual piston sliding in the rear), but the rears seem to wear rather quickly (25-30k miles) and when they do, you'll be replacing the rotors as well due to heat cracking. ( which requires a T-70 TORX bit and a REALLY STRONG impact gun.)
'03- early '04 models (pre 01-04 manf date) with the Dmax will have the LB7 engine, which will seemingly have injector issues for eternity, still waiting for GM to pony up with extended warranty on these.
The Dmax /Allison equipt trucks share the same engine and trans as the pickups, just different mountings and the engines are actually DE-RATED from the pickups. (it's all programing, the engines are identical)
If the truck doesn't already have a PTO set up, don't assume you can just bolt one on, many of the Allison tranny were not ordered with the bull gear in the trans to run a tranny mounted PTO setup.
you'll find a lot of truck with dump beds using electric/hydrulic dump systems. and many rollbacks/wreckers using a belt driven "clutch pump")
they are like "Really big Corvettes" to work on/repair nothing is easy to get at, changing the fuel filter is an excersize in anger management.
Dmax versions: Replacing injectors is like playing TWISTER. Oil changes without a pit are not bad, the drain plug is on the front of the pan, easy to get too, filter is a little tougher, you'll be backstroking on the creeper at best. Glow plugs are a breeze to remove/replace
8100 Vortec: plugs/coil packs aren't too bad to get too,
Anything on top or on the front of the engine is a PITA to get too, unless you are really small and can climb up into the engine.
We have sold 2 of the 4x4 versions, still waiting for them to come in for service, Dana Super70 hi pinion :drool: front axle with manual locking hubs, 5.13 gearing. Not sure on the T-case yet, haven't seen it.
Kevin