I'm a sk650 owner. The sk752 is going to be a great machine. Check on the tier 4 specification - there may be a forced idling period to reduce emissions, which is a no-can-do for tree operations. It will lack power for 36" tree planting augering or unassisted stump grinding, but will be fine for tipping and lifting. You may wish to swap tracks to narrow down to 36" access. The ground pressure is a little high on my narrow tracks. The hinge pin is lower than a giant or avant, and the tracks vs. wheels thing you already know about. Most of the current generation of minis are great machines, so I wouldn't say that the sk752 stands out. If it is like my sk650, the access to the engine compartment is inferior to the new vermeer. A comparable hours sk650 may be much cheaper and will be a better unit than the sk752, imho.
@hsell but proprietary attachments... you ever run into that problem?
If I were you, I'd at least test an avant 420 and also find out where your local ditch witch/kubota dealer is.
I'm gravitating to a dump bed roll off bumper pull trailer. One of my reasons is that the roll off helps with low hinge pin height. Your smaller unit may not have encountered the issue of grappling larger diameter logs over the side of a trailer - you just lose clearance. The sk752 will put you in 30" stumps, taking away 10+" from your lift height. I have a standard flatbed trailer and I occassionally have clearance issues. I've loaded a standard dump bed bumper pull trailer with 16" logs, which was suitable, but not easy.