HELP

Now retired i have to get a larger motor as we want to tow as large a caravan as possible to block up the road. We think a Range Rover or Cherokee

Seriously, we are thinking of a R R converted to autogas. as we cant afford much & the conversion will be about £1400 what faults should be looked for on an older model 94 - 96 perhaps.
How many miles will an autobox do? 200,000? How do i check the transfer box.
Are there any body, chassis issues?

Thanks in anticipation