Here is a copy of a previous post that may give you some additional info:
Inspired by Calbiker's rear motorcycle carrier, here are some pictures of the carrier I bought and modified. All of the commercial hitch mount motorcycle carriers I have seen only support the bike on the center tube. Seems something was needed to reduce the rocking motion. Calbiker had posted some pics a while back showing his method using small 1 1/4" receivers located at the end of each frame 'rail' on either side to accept some additional supports. I adopted his idea to add these to a Mototote carrier. I had sent Cal these pics and he thought I should share them here, since there are quite a few folks carrying motorcycles. The Mototote, brackets and bike weighs right at 400#'s. I usually travel with nearly a full water tank, but when carrying the bike, I run it just about empty. And on my model, that water tank is right up against the rear panel of the Navion, so removing that water is a must.
I also added the Fox shocks and Supersprings SSA-111 leaf springs, in addition to previously installed Sumos in order to help carry this load. All worked out well as far as stability and overall spring rate. BUT, the big problem was the small pavement heaves, etc. AND that problem and hopeful solution was detailed previously on another thread.
Attached Images
File Type: jpg DSCN2456.JPG (80.6 KB, 130 views)
File Type: jpg DSCN2458.JPG (81.6 KB, 105 views)
File Type: jpg DSCN2443.JPG (79.7 KB, 91 views)
File Type: jpg DSCN2444.JPG (84.1 KB, 90 views)
File Type: jpg DSCN2453.JPG (82.5 KB, 92 views)
EDIT: Sorry, it seems that the pics don't copy where they can be viewed. If interested you can go to my home 'page', search for threads started (not many really) and see the bike hauler listed.