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I assume at 16ft it is a double axle? There are many schools of thought on this. Commonalities are weight over the axles and bikes staggered if using for more than one bike. I like the side wall mounted adjustable tie downs plus floor mounted d-rings and the ride in and get off chocks. This link has lots of info. Motorcycle Trailers
Make sure you put at least four tie downs for the front and two for the back, and install a front wheel chock. You want to have six different contact points on the bike, you don't want two straps going to the same place.
On one trip this summer I had a strap fail. Even though I'd used all new straps, one of the front straps malfunctioned before I got very far and if I'd not had the extra strap on the front the bike would have flopped around for a 100 miles. I use the rear straps just to keep the rear end from shifting from side to side.
I carry mine on a flat bed trailer with a rubber mat to keep the tires from sliding and I have tie down rings to secure it at the four corners. Carried 100 miles over the worst highway in MI and it never moved.
7 X 14 enclosed trailer. recessed d'rings, Condor wheel chocks. Have bikes staggered, tried to put over the dual axles. if I pull 1 bike I put it in the rear position. Also have a weight distributing hitch and sway bar. Place straps around forks, engine guards and rear floorboard brackets.
I have a 7x16 "Haul'inASS" brand cargo trailer,
bought "e-track" and pitbull chocks. See attached photo's
What I like the best is that the e-track lets you place
any bike anywhere you want, you're not limited to where
it's gonna haft to sit.
I think I spent close to $500 for the e-track and snap rings
Hauls (4) sport bikes perfectly, I put the longer, heavier
Harlies in the front 2 spots when they get to play with us.
I have a 16' X 6' trailer although it is a utility trailer (open). Unless you plan on haulin' a lot more than a couple bikes I'd think a little smaller. To me a 12' would be perfect. Costs less, easier to pull and store, etc. If you do toll roads, the number of axles matters as well. Bigger isn't always better.
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