I would definitely not opt for any slide-in Keder rail
awning that would be wider than the track it slides into. FWIW, I got rid of the original Fiamma
awning that came with my trailer, and to me, good riddance. Then I went to a "bag awning" which took up a lot of room I wasn't willing to give up either, and was a total PITA to get into the Keder rail track. That went bye-bye too. After removing the O.E. crank-out awning, I installed a simple aluminum Keder rail on the side of my trailer and just use a simple slide in awning made from Sunbrella fabric. (From Marti's Awnings, link below.) It fits into a small "stuff sack" about the size of a football and probably doesn't weigh 5 Lbs. I store it in the trailer's front closet. It only takes a few seconds to thread the awning's Keder welt into the Keder track, and then it's just setting up 3 telescoping aluminum awning poles and guy lines to 3 stakes driven into the ground. And I think it looks good as well. I didn't want to mount it up any higher because I didn't want to have to bring a step stool along in order to reach the Keder rail, which would obviously be necessary if I had chosen to mount it higher up in order to also cover the entry door. (Face it, if the weather is that bad outside that I can't take two steps to get under the awning, I'm probably not going outside anyways.) It is good enough for my needs, and I can stand under it without hitting my head on it. (I'm 6'2".) All the Keder rail mounting screws, fender washers and Ny-lock nuts are inside the overhead cabinets, so you don't see any of them either.
Works great for short stays of a day or two. If we stay anywhere for longer, I'll set up my pop-up screen tent.
https://www.martisawnings.com/