About a year ago this was discussed on here. The main thoughts against it were the braking system and the lack of weight that the MJ that will do the towing has.
I wish I could think of the name, but you'll want to get a thing on the second Comanche that applies its brakes as the tower's brakes are applied.
The concern with weight is that your towing Comanche won't be able to hold back the towee.
If I was going to tow a Comanche with a Comanche, I'd have that brake thingy I was mentioning, an upgraded front braking system (something that requires 16" rims), a rear end that I wouldn't be worring about with some big drums, and a fully reinforced unibody, not as much for strength but more for extra weight, distributed through the entire truck.
With that set-up I'd tow 30-40 miles.
With a dually rearend and on a long box truck and somehow more weight and a larger motor, I'd be comfortable going farther.