2020 Ford F350 - XLT or Lariat / options guidance?

You can register your truck/TC combo as RV, what in CA will save about $500 in annual weight fee, but then you can't drive it without camper and God-forbid use it for material hauling.
On other hand, having commercial registration you are subject to driving via DOT scales.
Never heard about dually making any difference, so I think that part was BS.
Point is, that once you have RV registration- you are off the hook for parking commercially.