Xtrail towing massive caravan

Pulling out of work today and pulled up beside a great looking van dual axles, air con on roof very flash looking van. I would say 18 possibly 20 footer. Had a roll out awning mounted to passengers side. I lined the prado up inline with the awning and could have parked it length wise under it had it been rolled out with I reckon 3 foot spare front and back. Then I noticed what was pulling it. An xtrail with the bum nearly hitting the ground had it not been for the dual axle on the van I reckon there was a chance it would of. Couldnt believe it. Two elderly couple in the front seats with rear seat folded down with what looked to be an engel fridge and some other bits and pieces. There were stickers on the rear of the xtrail obviously where they have travelled two. Now I know the xtrails are a top vehicle and reasonably powerful bout 125kw for memory but boy how he even got it to move off the mark had me wondering. I would not like to be infront or coming towards him if he was on a downhill run reckon he'd be lucky to pull it up. Now I am no expert on weights of caravans but I would say it would have to be around the 2Tonne mark. Great to see eldery people still travelling around this great country or ours but what I saw was a very scary thought. Im surprised they have never been pulled up by the RTA or do the xtrails have a great towing capacity and am I way off with the weight of the van ?? Regards Steve M