You will need something either long enough to put one behind the other or wide enough to sneak a bike tire beside the bags on the Spyder. That probably translates to an 18' trailer or possibly a 16' V-nose with a width of at least six feet at the door, on one hand, and an 8'x16 or 8'x14' V-nose on the other. An even wider toybox might allow loading almost side-by-side in a staggered fashion. The best thing to do if you find a candidate is to carefully measure the inside and door dimensions, then lay those out on the garage floor in tape, to see if things fit. Remember, you can't cross the lines with any part of the machines, even when loading. A good dealer may also allow you to test load a trailer in their lot. Good luck in your search.