Since you'll be fulltiming, you might overweight a Class C with the van, a tow dolly, a scooter/motorcycle, plus all your personal belongings. You'll want to look at those weights carefully - especially if the RV price is going to be tight.
Also, while you've got driveway camping worked out, that could fail if you get too big or too much. An RV, van, car/scooter/motorcycle, flatbed/tow dolly is an awful lot to park in a driveway when you're the only one using it. Add in the owners' vehicle(s) and that could get tight quick.
To me, the practical choice would be to keep your truck, buy a TT, and use your truck for work claiming mileage. The distance traveled for work will be less than it is now because you'll be moving around accordingly. With the money saved by buying a TT instead of an MH, you can set it aside to replace the truck when you retire. That gets you through the next year with as little trouble as possible and gives you the ability to use the TT for camping later on.