Jonantahn M, the alko ball is definately spaced higher not just slimmer, i fitted two last week and held them side wit normal onces to compare. by side to compare.
I agree with andrew K though i have towed many large caravans much heavier than the towing vehicle with no problems! and have always been disapointed by troopers towing ability, for a big car i expected them to be better!
i remember the big old gass windowd Romas and Buccaneers never swayed an inch depite being much heavier than the towing vehicle.
In addition to the advice given by Andrew K, I have allways found having the height of the caravan nose right helps. idealy it should be level or slightly nose down, with a nose weight close to the max allowed for the caravan, towing vehicle. Not over inflating tyres on towing vehicle and caravan also helps!
to be hnest i have never found 4x4's in general to make great towing cars, many have good toruque and performance but this means litte to safe towing, and speed causes more problems than it solves!
My towing favourite is a good old rear whlle drive transit van, the floor is level with the vcaravan floor saving 'under currents' from lifting the nose of the caravan, and the head on profile reduces wind drag (and hence swaying) along with it being wide enough not to need those silly add on mirrors that you can never actualy see anything in!
BUT bet advice of all, take your time, make a pint of staying calm and relaxed and ignore the idiots on the road! who drive up behind etc. etc.
you have as much right to be on the road as anyone else and can by safe driving set a good example, speed isnt everyhting, and it is virtualy the only objection i ever hear about caravans, that is usually unfounded when it is though about in a logical way!