If I understand the OP correctly - please chime in - It's not a matter of simply moving the dolly around, it's storing the dolly behind the MH with the tongue slid underneath. In which case the various suggestions to move it around won't help. You have a few options; put it in the spot you want and back the MH over the tongue (someone watching of course), push down on the ramps enough to lift the tongue and slide it under, get a 12' pole and with one person on each side of the MH hook the pole under the handle and walk it under, or get something like an off-road skateboard and bungee the tongue to it to use as a creeper to roll it under.