When I was at the Equinox the first time ALL the resort vehicles were Land Rover Disco's. The Off Road school is alot smaller now, with only 1 or 2 instructors and I think only two or three vehicles vs. the 6 instructors and 6-8 vehicles when Land Rover was a corporate sponsor. SO my geuss is that the Land Rovers are left overs.
The instructor we drove with this last time was an ex-militatry HMMWV instructor who seemed to know his stuff. Polite, professional, and fun. We learned about brake/gas modulation, lockers, articulation. Overall it was a really fun time. The trails are tight, rocky, and rooted. Definately nothing outrageous as they take rank novices out there, but they allow you to switch drivers if you want and will tailor instruction to your skill level. My wife drove basic stuff that was fun and challenging for her and then I drove some more difficult areas.
I typically don't go for resorts, but the Equinox is incredible. I just love the place. The service is great, the spa is great, the food is great. Basically, it doesn't suck

.
We live right outside of Boston in the town of Bedford and love getting up to Vermont. Very relaxing and a big change from suburbia/city life.
I hope that this helps.
Rob (Ipedog)