Longest Land Rover procession, Towcester racecourse.
Highest altitude attempt, somewhere in Italy done by the Aosta Valley Land Rover Club in the 1990's I think.
Fastest ascent of Ben Nevis in a vehicle, sometime in the 1980's I think.
EDIT:
Not that I can understand a word of Italian, I found
THIS about the altitude attempt on the web.
Also
THIS &
THIS ONE seems to be in French.