This is a media ad for an ALKO stabiliser. I show the above because it depicts the spare wheel in place just to the rear of the axle. 

My Swift touring van has a recessed position in the front locker compartment for the spare wheel, but to get the weight on the towing hitch down to the max 75kg permitted by Land Rover for my Discovery I had to relocate my spare wheel as shown above. This is a common problem, even with some current new caravans.