Curious as to how you've found the hitch to be a simple swap.
I'm not a huge fan of the Maxx Coupler and was noodling the idea of trying to retrofit a DO35. But those are designed for Aussie-style tongues, not a 2x2 steel tube. The bolt pattern is too wide. The "easiest" solution I could come up with was having someone weld up an appropriately sized piece of steel onto a 2x2 tongue to insert. Do you have a different solution in mind?
As far as tires...the limiting factor we (Aaron and I) found there was the size of the wheel well. Granted I was trying to stuff 35s on it. When he mocked it up, the concern was that everything was danger-close; particularly if there was any mud/etc. packed onto the tires. Not sure how switching to a CM suspension is going to remedy that, but you're also in a, slightly, smaller tire. Interested to see what the CM conversion may run you. I had considered something as the Timbren is a bit bouncy given the lack of any rebound damping, but the CM may be OVERdamped. At this point I've just adjusted driving style/speeds on the trail. But for an Arkto 2.0 in the future for us, it may be worth it as it's always less expensive to have done at the time of manufacture. I asked about retrofitting to have AC added (wasn't an option when we ordered ours) and the general consensus was...just order a new one.