Hi Our 17ft XC2 2007 is plated at 2210kg tare with 160 kg ball load and 2750 ATM and we towed it 10500 km back to WA with a Terracan without any towing problems except hill starts are a fine art. Average fuel consumption over that distance was 14.6lt/100km and we were able to cruise at 100km/hr easily. Hill climbs were no problem including over Atherton tablelands, New England highway and the steep climp to Maleny from Palmwoods via Monteville. If your Prado is the latest Common rail diesel then it would tow a 17ft XC such as ours easily and economically, however if you have the old low power Prado forget it. I doubt your 18ft XC will weigh 2200 kg more like 2300kg. The legal tow limits of the Prado may be the same as the Terracan 2500kg, where the 2500kg is the GTM of the caravan which is the weight on the wheels giving a legal ATM of 2750 kg with a 250kg ball load. I verified this with Queensland Transport last year before confirming our order. Talk to Stan about weights and specs and ask him about the XC2 that went to WA at the end of October last year. Do your home work and really think out what you would want to do with your van and where you would want to go. All the best