I use a std car trailer sometimes, based on vehicle. Just watch the combined weight of vehicle and trailer together. As stated an aluminum trailer is lighter, but a lot more cost. The trailer is a bit of a pin once you get somewhere, as you now have to have space for the MH, trailer and vehicle.
As to using it as a deck? Most trailers are not a continuous surface. Plus the leveling of the trailer aspect. You have to walk over the dirt/grass/weeds from MH to trailer deck anyway, so I am not seeing much benefit to this.
2005 Kenworth Showhauler truck conversion.
. 44 ft, Cummins ISX15 450 hp, 10 speed, twin screw
I used to have a handle on life, but it broke