We recently bought our first e-bikes, an Ultimate C380 and Arroyo C5. In searching for bike racks that were rated for use on travel trailers and could carry two roughly 50 pound bikes, I decided on the 1UP Super Duty Double. My trailer hitch on both the trailer and my SUV are fairly high, and we're both short, so I added the long ramp to my order. I also got one Fat Tire Adaptor Kit, and mounted one to each bike rack where the rear tire would be. This accommodates the fender stays. I got the foam cushion, which works okay on the C380's aluminum fender, but deformed the C5's plastic fender. But once I added the fat tire kit, the wider aluminum tire clamp is able to slip between the fender and the tire, securely locking the bike in place.
It took a while of back and forth, and I could have saved some money if I knew up front what would work. I originally ordered the short ramp, and had to swap that for the long version. I originally ordered the matching four wheel locks, but then after later adding the fat tire kit, I had to add longer skewers for the locks. And then I added the EZ Pull handle and license plate relocation kit with lights.
The photos below were before I figured how to put the tire clamp under the C5's fender, so you'll see that U tried using a piece of split pool noodle underneath for support. That didn't really help. Going under the fender doesn't work on the C380 due to the much lower fender stay position.
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