This VM motor has been used across the pond in taxi's & achieved a 250K life spans. In the same token - there have been a very few here in the states that have had an early demise (under 100K). Look for the lower mileage rigs if possible. At the 100K mark, they are due for timing belt replacement and the rest of the ancillary parts needed to do things right. Not inexpensive.
They do tow like nothing else for it's size. Highly recommend putting a eco tune on them (GDE), does wonders for these puppies.
Have never purchased a towed rig, so no answers for you in that respect.
05 TJ RME 42RLE with some things
05 KJ CRD 545RFE, GDE Eco tune, Franky II, Al's 4.5 A-arms, JK Rubi Moabs, Silent Armors 245-70-17's, Spidertrax Adapters, Rola Basket, Fumoto Valve, Pinch welds pounded
FS or FT (2) JK Rubi 17" Moab Rims - really nice shape
Need JK Rear Spare tire bracket for project