I have a 2017 Kawasaki Concours 14, 2014 Yamaha Super Tenere, and a 2017 KTM 500 EXC (as well as a couple of four stroke trail bikes for the kids).
This is a great solution and the one that I intend to use as it doesn't require you to compress the forks (Causing leaks through the fork seals). The only caveat which I haven't figured out yet is getting up under the gas tank to install the through bolts.
https://www.pit-bull.com/motorcycle-trailer-restraints
I did 9000 miles last summer with just the Yamaha and the bike fell over several times. As the trailer bounced the straps could slip off when the bikes suspension compressed. It's fixable using straps with locking hooks, but it's still taking up a lot of room that other bikes/ATV's could be using and it's not good for the bikes suspension. It's a big dirt bike with crash bars, so no harm done to the bike from falling over, just annoying.