I am an old hand at this, and as such, made every mistake possible. First off, use QUALITY tie downs. I use the big Ancra cam lock ones that are about 2" wide HD used to sell. Some prefer ratchet. IMHO a wheel chock is mandatory. Had a buddy drop a brand new Ducati trying to trailer without one. A cheap one is fine, as long as it is mounted properly.
Also use quality soft ties. Your attachment points should be as high up as possible front and rear. I use the upper shock bolts or passenger pegs rear and the lower triple tree or handlebars front. Put the front wheel against the firmly mounted wheel chock which should be mounted in such a way that it cannot move, at all, preferably against the front of the trailer. Compress the forks slightly, and tighten down the tie downs, with the lower hooks to a secure mounting point on the trailer foreword of the attachment points on the forks or handlebars. You are pulling the bike forward with this. Do the same for the rear, except mount the lower hooks rearward of the mounting points on the rear of the bike. Now you are pulling backwards. Compress the shocks, slightly, then tighten the tie downs. I always run a bungee between the front tie downs, through the wheel, to keep tension on them going over bumps so the hooks don't pop out of the soft ties.
Drive for about 10 miles, stop, then re-tighten everything. Also, if you are using an open trailer like I do, be advised that when these nylon straps get wet, they loosen.
John, Medina, TN - 2003 Honda ST1300 ABS, 2011 Kawasaki KLR 650, 2012 Ducati Monster 1100 EVO
2017 HD Road Glide Special