Eagle , you've been through a Lot lately .... No wonder you're tired ...
But this will give you a little time to relax and contemplate your trailercosmetics ...
Seems (excuse the pun) that the only seams that are apparent are the side ones and the offset one on the roof ... Now seeing that you're using the straps to keep the TD from floating away .. I'd get some THICK canvas and carefully cut out two strips wide enough to accommodate the straps and then some (good time to use those pinking shears ) ... Then you'd have a perfectly Logical reason for them being there .. strap protectors

Painted in a contrasting color (perhaps a Leather color or the interior color of your car ) it would be a cool and Practical accent ... (for you ladies , like they do on those purses... you know All about that

) That would take care of the roof , and you could use the straps to hold the back hatch down too (as in a stagecoach ) ... Nobody would know the other seam was there ... except you and me , and a couple thousand readers...
Now for the side seems , My idea is to get some of thet belt webbing from the yard goods store ... It would easily conform to the profile edges without distorting , and just glued down over the old seams and painted too ... Simple , Thrifty ... The main objective...
Note: I did look at some vinyl/chrome trim strips for autos , but as Nice as that stuff was , it was a bit pricy ...

I think the webbing gives a better bang for the buck ... It's essentially just more canvas eh and would reinforce this "edge" area even more !!!
And then you need a drip rail over the doors , all the rain you're getting ...