I have been doing a lot of reading around, including caravan forums.
The jury seems split on the allroad, some love it and some hate it. Almost like Marmite, there doesn't seem to be any middle ground.
I'm not too scared of the air suspension as the Rangie has the same and has not been a problem once in the time I have had it.
The VP44 concerns me more to be honest.
The Passat seems to be far more popular though, lots of people seem to rave about them as tow cars.
I guess if there is a chance of rough field caravanning (like the BBB) then an allroad would be better but for normal UK and European caravan sites, a two wheel drive car that does 50+ MPG when not towing makes more sense and, with a remap, the 130PD can match the power ouput of the V6
I will still have the Discovery for going to rough camping areas like the LRO show at Peterborough and the BBB after all.