I bought myself a 3.2 Executive as a 60th birthday present and considered using it as a towcar - no problem with power, it has rear wheel drive and contrary to peoples perception, big Jags are relatively economic - mine did 26 mpg average which is better than most large petrol 4x4's.
The big no no was the lack of ground clearance, which you must be aware of too, as an owner - mine would ground it's rear exhaust pipes on my sloping driveway even unloaded and with a van on the back I worried that there would be severe problems on most field sites.
Spring assisters might help but I chickened out and stayed with 4x4's for towing.
The Jag Drivers or Enthusiast Clubs could help perhaps, some members might be vanners.
