Towing it with a Toyota Tarago(Previa)?

So here we were with 1.5 Tonne caravan and a 2.4l Toyota Tarago to tow it.  I new that if I was serious about the plan, I would have to get the right vehicle to tow it eventually but options are pretty limited when you need 8 seats. 

In the interim however, I fitted a electric brake controller to my sisters 2002 Patrol and took it for a test up to Hervey Bay in September 2010.  On the way up it was towing fine until I heard this massive air blasting sound and a loud gurgling coming from the engine.  "Oh great" I thought as I pulled over "borrow a car and blow up the turbo".  I ferreted my way around it and discovered that the hose after the intercooler had popped off.  The pipe clamp was still on so I was able to eventually get it all back on. ( I have heard that the hoses on this Patrol do need to be kept tight or they will pop off)
The next test drive was using the 2002 Tarago. 

I kind of thought this was going to be a big ask and had visions of being stuck halfway up a hill with nothing left to give and needing a tow.  I bought an inclinometer and tested towing it around our suburb and discovered that it was able to hill start on a 17% gradient.  I was very aware that I had to look after the automatic transmission.  So after replacing the fluid and regularly inspecting it on the way I took it fairly easy to a campsite in Canungra.  Then up to Lake Cootharabah and then finally up to Bundaberg over Christmas where we waited  for the flood waters to come down in Brisbane before coming back.  I averaged around 17 litres / 100km. Interestingly, the challenge for the vehicle was not so much the weight but the sustained load due to wind at higher speeds.