Hi Gary
I tow with a 2.5 diesel swb Pajero with no problems. I've owned the car for 4 years now and find it to be reliable if a bit thirsty round town. If I just use it in town for short trips and stop/ start motoring I only get about 22mpg but this can improve to about 30mpg on motorways etc at sensible speeds. Towing is in the low 20 mpg area with a t/a caravan but steady as a rock up hill and down dale.
These cars need regular engine oil, fuel and oil filter changes to remain trouble free and without smoke and a good website to look at is the free to join Pajero Owners Club
http://www.pocuk.com/howtojoin.htm
The club has good advice for prospective Pajero owners and deals comprehensively with maintenance, parts, insurance etc.
Hope this helps