This started as a HF trailer. I cut the middle out and narrowed it about 6", just a hair wider than my handlebars. Stretched the tongue about 12".Made a hitch for the bike and a swivel coupler from a center link from a tractor.
Never pulled a trailer with a bike before.
Easy handling! Rode it back and forth to work a few times, then did a 1300 round trip to Niagara Falls and back.
Dog loved it!