If I remember correctly, CLC prototyped the camper on that specific trailer, right? And of course, they included the bunks as part of the kit for the purpose of fitting on narrower trailers. So surely it’s been tested?
Personally, I had considered going this route at the beginning. But I decided against it as my biggest concern was stability and highway travel. I don’t think the camper alone would be too much for it, but I put the roof rack system on mine with the intention of throwing a kayak or two up there, or other ‘stuff’. Not a lot of weight, but it would shift the center of gravity enough to make me uneasy.
Another thing to consider is how much higher the camper might be sitting as a result of using the bunks on a trailer with 12″ tires (If I remember correctly, that’s what the HF trailer uses?). Would it potentially put the galley at an uncomfortable/inconvenient height for you? Also, would it make it more difficult to get in and out of the camper? FWIW, I’m 6’1″ and I’m using the CLC trailer with 12″ tires. I wish it sat a little lower for these reasons. I can’t imagine that you can mount the axle overslung with that trailer and still maintain clearances on the shell? This is a preference thing of course, but it could also contribute to the overall stability and usability of the camper, IMO.
I think that all trailers that are not the CLC official one will need SOME form of modification, whether it is extending the tongue, moving the axle or even shortening. So, if you’re willing to take that on, then I wouldn’t let it be factor. But my opinion is that I think you’d probably be better served with a trailer that is a bit wider, but that’s just my opinion based off my needs and concerns. And FWIW, @friz used the Northern Tool 5×8 and made some mods to it and has had some great results. While I know it is a bit more expensive than the HF trailer, something like it in either construction (aluminum or steel) might be worth considering.
Hope this helps. 🙂