If you have a wheel chock system on your trailer there is no need for excessive fork compression. My Kendon has a chock type of device that holds the front wheel in place. I normally run a strap around the chock and wheel then to the trailer for insurance I guess. I use two straps to the bars with Canyon Dancer straps to help stabilize it and go. No need for three bikes to ride 400 miles of slab to get to the good roads when you have a trailer for gear and supplies. Of course if the slab is the ride, Im all over it and ready to go.
If you don't compress the forks, even with a chock, the straps will come loose when the forks DO compress from bumps in the road. Be very careful if using Canyon Dancers, the handlebars are aluminum and you hit a large bump the handlebars
can snap. IIRC, someone snapped one of their bars by strapping them down by the handlebars. Go under the fairing and go across the triple clamps. Just watch for the 2 wires on the right side, and it is a PITA (Pain In The A$$) to get the straps under the wires.
I have had to trailer my bike 3 times in 2 years. I move around the country a lot and need both my car and bike with me.....