I think dune sport will make a custom toy hauler to your specs.
We have a 2009 23 ft. Wife loves it. We do not have a front bed, but rather a rear queen bed that hoists up. Fits both quads. I prefer to turn our bikes sideways over the axles and still be able to use the kitchen/bath during transport.

Riding buddy is now considering one. I keep suggesting atc which are on the premium side.
I will see what he decides.