If it were me and I wasn't planning on traveling with my toys I'd probably get a travel trailer that fits my family needs, then look or a enclosed utility trailer to store the ATVs and haul them home in.
The TT will probably sit lower to the ground, thus easier to block up and stabalize. Cost should be a lot less as your not paying for an extra 12' or so of space that you don't sound like you really want. Plus you're not paying premium for that cargo space. You probably won't be able to use the fuel station anyway.
Before you jump at buying something new, look around at used units. If you use a hauling service then you're not worried about truck limitations too.
While we really enjoyed our Raptor Toy Hauler, having our Motorhome and the ability to haul our ATVs, boat and now Jeep have made it a better fit. Plus as you noted the extra living space has worked out well.