That's awesome, Jake! Congrats. You think that old beater would make it to OK?
A tad nose high is fine. Remember, the more you camp, the more shit you will be packing in the truck bed and the storage in the RV which is far forward of the axles. I'd plan on having some height to compensate for that. Better to be a touch tall than a touch low.
Your fridge is the only thing in the camper really level sensitive, so if you plan on running it on propane while in transit, anything withint 3 deg of level is fine according to the reading I've done.