I consider it necessary to have the front wheel in a chock of some sort.
That requires it to be vertical or close to it. Ratcheting straps versus pull type, at least for the front. You don't want to bottom out the suspension, but I don't leave enough movement for hooks to come loose. A backup rope makes me feel better. For our race bike, we have a large rubber inflatable bladder that goes under the frame, it takes some of the load from the suspension and also provides some give.
Getting the tie down straps at a good angle helps too. And watch for all the other loose stuff in the trailer.
After a few miles of towing, recheck everything.