Waxed the camper this weekend. Any tips/tricks for future?

Yep, that's a real nice truck. That truck will not emit any soot. Just look inside the tailpipe and you will see clean, shiny silver colored metal. No black soot inside. It all gets trapped in the dpf. Perhaps your dads is different situation. Anyway, at least your taking good care of the trailer by waxing and cleaning whatever it had on it. Good luck whichever method you use.