I've had many discussion with the DMV and I've gotten just as many difference answers. The common theme I tend to get the most is that you register your truck under the CVRA based on hat it may tow that falls under the CVRA. Since an RV is a trailer coach which is exempt under the CVRA you don't have to count it's GVWR. However if you tow anything else then you do have to account for it. Are they right? I don't know.
So you get your truck and register it for 10,000, or more if you want to tow something other than your RV, then tow your RV. If you get stopped you try to convince the officer you're legal and if he says no you go to the judge and if necessary ask for a jury trial and hope for the best.
OMT, cut some flat stick on magnets to fit the CVRA stickers and slap them on if you think you're going to need them. Oh, sorry 2017 Ford Super Duty owners, you have to figure out something else since your cab is aluminum:B
