Reason why I use a used boat trailer is because while my garage floor is slick as a baby's behind, the apron and pad in front of the garage is broom finish so small wheels won't work well. That and the fact that I leave the camper on the trailer and move it around the yard as necessary. I left the long boat trailer tongue in place so I don't bang my head on the cab over when using the quad to move it. I did however, cut the tongue off and slipped in a length of square tubing with pins so I can remove the tongue when the camper is garaged.
Nothing worse than busting your shins on the tongue sticking out. That only took one painful time and it got removed.