Weeds, I currently own a 2013 Diesel 4dr have so for the last 2 years, before that I had a 2012 Grand Cherokee Laredo diesel and before that a 2009 Diesel 4dr Wrangler.
I tow a conqueror 330 with mine no problems at all, in fact you forget that it's even behind you quite easily.
Paul is correct though, I run slightly larger tyres on mine that standard, 285/70r17's, when you get into hilly area's I find it easier to bump the gear lever over into manual and chose the gear I want to be sitting in.
For a family of 5 you would be learning how to pack lightly as Paull said, the space in them is at a premium due to the design.
I'm a self confessed jeep nut and I love my wrangler to death. If you have any other questions please feel free to ask and I'll help where I can.
This is the link you are chasing for most of the technical data for the unlimited
http://www.jeep.com.au/brochures/model-specs-wrangler-unlimited.pdfTaken from there the tow weight for the 4dr diesel is 2300kg and Gross Vehicle Weight is 2585kg
One last thing I'll say about wranglers, actually Jeeps in general, there tend to be two types of people that buy jeeps, the first are the people that love them to death, they put up with all of the little quirks that come with owning a jeep and fall in love with their jeep. Paull, I would say, falls into this category from his comments above.
The other sort, buy a jeep and they hate it from day one. and they also tend to get out of it as quickly as they can. My wife when I first met her thought I was a total nutcase when I told her this. She now owns her second 2dr wrangler and I would say she is more of a fanatic than I am.