We are shopping for a new setup now. We debated motor home vs. toy hauler for quite awhile. In the end we narrowed our search to toy hauler fifth wheels.
My reasons for the trailer route were mostly practicality. In a mh you'll need a toad, so now you've got two vehicles with engines and related expenses. A truck can be used year round for things not related to rv-ing. A mh can't practically haul your stuff to the dump etc.
I love the ceiling height in a fifth wheel. I love the safety of a crash tested Truck with airbags and crumple zones. I always thought the idea of being able to move freely about the mh while underway would be nice but I'd never be able to take advantage since I'm always the driver. Between fuel and food stops we are Stopped enough my wife and I can use the facilities in the trailer without feeling like we are wasting time.
If I were in your shoes I'd buy a big toy hauler and one ton dually. I'd get a fiver hitch that removes without leaving rails. I'd assemble all my show gear in the garage of the Toy hauler on easily wheeled boxes or platforms. If I couldn't unload at the show I'd setup at camp and load everything into the truck. With the right spot you could even angle the ramp upward and dolly everything into the truck.
You can't go wrong either way. Ultimately it's whatever makes you and your wife happy. Another point to consider is if far from home and a breakdown occurs it may be easier to service a pickup rather than a mh. At least with a trailer you can live in it while they fix it. In a mh you'll probably need to stay in a hotel.
None of these single items would make or break a decision but all food for thought when you make your pro/con list.
