We have a Ram 2500 Cummins with a 33.5 foot fifth wheel Sandpiper by Forest River. It is more like 36 foot long so don't be fooled by the model length. New Rams have an excellent built-in fifth wheel and goose neck setup. There are several aftermarket and OEM hitches available for the truck. I have a mega cab which only comes with a short bed. The trailer hitch weight needs to be over the axle. But when you are maneuvering the trailer could hit the cab so a slide hitch would be needed to slide the trailer aft for maneuvering. This is not a problem with a long wheel base.
I think 35 to 40 ft. Rigs are ideal. My wife and two large dogs are comfortable in ours. The Sandpiper is an entry level rig. It has high quality equipment assembled by rookies. There are only a few companies that build reefers, air conditioners etc. so the equipment is similar regardless of trim or price range. I like the idea of getting one with king bed standard but getting the queen instead. If I were to go full time, I would look for the largest reefer, 50 amp service, dual air conditioners, independent slide controls, large basement storage, and large tanks.
I think your camera sizes will have to go down, but wiring beneath the rig will be easy. Maybe invest in a mechanic's creeper. Also, keep in mind that they will complicate things when traveling.
Good luck with your endeavors!