I've had setups where my truck / trailer (and not only RV's) was within the "numbers" (GVWR, GCVWR, axle ratings, etc) and the truck sagged so much that I simply didn't like it. Airbags, helper springs, etc would help level the setup, even if not affecting the numbers / rating
...hence airbags would have been a desirable feature.
The basic question is whether one will be concerned about the numbers...if you're going to stay within them, then for this posting, a dually is probably the truck to get. If one is not going to be overly concerned about the numbers, probably a new-ish SRW truck could work.
I always tend to want to stay in the numbers but in years past, based on CAT weighings, I've had one combo that was about 15% over the GCVWR, although within axle and GVWR, and strangely enough, in about 15,000 miles with that combo, it didn't blow up.
