I have been hauling motorcycles for 10 years. my profile pic. is a softtail on a 05 32 ft. Everest ,currently have 2010 jayco designer 35ft. with a 08 electra glide classic been from pa. to maine fl. Colorado Montana and Utah. without issues.
first thing if you don't have a trailer yet look for a model with a high carrying cap ,my jayco factory spec. is 4100lb. actual from scales 3700lbs.
axles of a 5er are aprox. 1/3 length from rear .36ft=12rear overhang so
900lbs. on rear removes 300 from pin and both or 1200 lbs. to axles . A lift and a touring Harley will exceed 1,000 lbs so some frame strengthing should be done just for peace of mind. I added 3" sq. tubing x 1/4" wall to bottom of frame and after 20,000 mi. everything is fine. cat. scale axle weight= 13,470 which is 500 under GVW. and no handling issues
swivel wheel is probably better but could not no one would declare legal in pa. Also one concern was with a swivel wheel at a entrance road if rear of trailer comes close to the ground does the bike hit back of the trailer or in the reverse circumstance how much increase in elevation form axles to rear of the trailer can it tolerate before the bike is pointed at the stars. I asked Idaho tote ,they never responded
I assume these situations can be avoided while traveling. good luck.