[jocko]

I'd say it's probably borderline. Good that no burnouts are planned - but pulling a camper is probably the bigger concern - that will stress a trans also, not via burnout shock. How big of a camper are you talking about?

If I'm not mistaken, stock Mustang WC T5's were only rated at close to 300 hp - but it's the torque that'll kill the trans, not the hp, per se.

If it's a small trailer and you're going to go easy on it like you say - then probably no problem - if you're talking 5th wheel max GVWR setup, then the bigger engine won't matter, the continual load will kill it. Hauling heavy isn't really in the T5's playbook. But again, if small camper, pop-up type or small old-school, should be ok. But to be honest, might be pushing it a bit (the load of the camper, not the crate engine). My 2 cents only though, don't know of a real definitive source of just how much a T5 can withstand for hauling purposes...