I have an Aluma 6810. The X fits perfect and the empty trailer is only 440lbs. I am a big fan of all aluminum trailers. I hauled it on my Triton ATV 88 a few times but it was not pretty. The Triton trailer was 104" long and the X wheelbase is 95". I strapped the crap out of it and made it work but I was really happy to get the longer Aluma. It cut my load and strap time in half!
Consider this one very important potential issue. I had a 10X6 carryon. It just fit with the rear gate up. That was until I put wheel spacers on. Then I went with paddles. It also did not like my ITP beadlocks. All were too wide. My solution was to cut the rails and add 5" of angle starboard and port. Not exactly what you want to do to a brand new trailer, but it was an easy fix for me and I had 40' of mild steel angle sitting around and too much .030 taking up tool box space. BUT - that was not where the challenges stopped. Even if you are just going to tote the cat around on stock wheels, the more important concern is how it wasted axle bearings after about 2000 miles. The placement of weight in the rear made it impossible to balance the trailer and it did not track very well. The 3500# axle had damn near come apart at the hubs when the bearings went. $30 in new bearings and I was back on the road. I ended up selling it and getting a real trailer (20' buggy trailer), but I get that's not what you're aiming for. The 12' would be better but just be prepared to inspect the bearings every few thousand miles. I would go 14' and place the weight more strategically.
I use a ziema F511. Its made for rzr xp4. I literally got it because it is the smallest and lowest trailer for the wildcat. I can back into my garage without taking the wildcat off and there is no drop gate you just drive up it. Also because it is made for a sxs the axle is positioned correctly for weight distribution. It tracks perfect and i've had no problems with it at all. If you are looking for the smallest, lowest trailer that is it.
Side note I have seen people driving on the highway with trailers that look like they are driving driving themself lol. I think most people park foward when they prob should park backwards on the trailer for the weight.
Yeah, I don't know how you'd fit a Wildcat in the bed, unless scoobydew also has a Trail. I have a 6x12 and it's perfect. If you were real tight on space you could maaaybe fit it on a 6x10, but you couldn't put the end gate up, then back it on or pull it on for load distribution. But just buy a 6x12 and be done.
You could always run a ratchet strap between a-arms and rather it to crank the front end in. Just do the same for the rear knuckles. I had to do this once to get my Wildcat on a friends trailer that was 64" and I had 2" spacers all around. Not ideal but it works