I purchased an 8 foot Dometic all inclusive (legs fold into bag also) awning
, rail and solved the puzzle on "how to do it"
It does hang a little long front and rear, but only a few inches. Its stable at 70 mph and doesn't even wiggle. Its easy to set up, but there is a learning curve. It would have helped to have the telescoping poles explained in the instructions so they didn't just randomly fall
out or collapse while wrestling with it solo. They twist to lock. It comes with vertical legs and 45 back to trailer legs. Use both or just the 45s. They require a bracket attached to the trailer. I was sneaky and mounted them to the LED light
covers. The rail was cleaned and 3M VHB double sided tape applied. I marked 12" down from the roof bump and make some grease pencil marks along the area I wanted the awning
then cleaned the Zep polish of with a wax and grease remover. I then laid the awning
in position and used 2" tape to hold it in position while I pulled the 3m backing loose, working my way front to back. Drilled 4 holes spaced evenly along the rail and used a 2 pull structural body rivet.
This is the $149 shipped to your door Ebay Dometic awning and was installed in less than an hour. It took longer to realize the poles twisted to lock.