For excess strap I roll the ends up same as shown in this video, I just do it closer to the handle.
https://m.youtube.com/watch?v=c7j_A1Bja_w&feature=youtube
I would also tie the rear down, either a strap over the wheels or direct to the diff housing to the trailer at a minimum angle.
It’s the forward movement under heavy braking that also needs to be considered.
It wouldn’t be hard for you to make the roller removable similar to the tow truck method,a guide hole ford the pin and a basic “L” bracket into the deck.
Have a close look at what the local tow truck use and what the larger trucks do.
I prefer to tie down rather than forward and rearward, car tie down.straps - Google Search
I wouldn’t travel with the ramps against the vehicle as they will rub as the suspension on the vehicle will still move.
For the ramps a fixed length of flat pined/hinged at each end works well particularly as it’s a 1 vehicle trailer.
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