A possible solution for your trailer is to install a double wheel tongue jack. Roll the trailer up to the 5th wheel empty, hookup than load the ATV's on. I have a tandem axle landscape trailer & move it this way providing the ground is reasonably level. eHoefler is correct you will void the warranty. I see many double towing though. I'm considering it myself. Where I live we can double tow up to 75'. Dealer has offered to install a hitch providing I don't overload it. I plan to tow 1,500 pounds total. You will have to check the laws in each state you plan to visit.
Good luck.