We've got the 3124 model and tow it with a mercedes ML320. It's a bit marginal but we do fine. It doesn't heat the engine up more than a couple degrees up steep hills and I don't really try to break any land speed records for obvious reasons. The one thing you do need to think about is storing it. In my case, an extra two feet probably would make my life much more difficult with the driveway I cope with. It's steep and windy to boot. learning to back up something like this, I suspect, is somewhat size independent but this is my first trailer (had a class C in a previous life).
The TM is truly a unique product. Even the Hi-lo is very different, which is the only other product out there that's even close. It sounds like you've done your research so, if you have the room and the funds, I don't think you'll regret your purchase.
Phil
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