I know folks who build rock crawlers or buggies out of the Geo tracker's or Suzuki samurai's. Don't know if they are any good in stock form or not.
Suzuki Samurai are very capable little 4x4’s. Geo trackers (Suzuki Sidekick rebranded) are not. They are unibody vehicles that allow nowhere near the articulation of the Samurais. Samurais have actual frames and can be modded out basically like mini Jeeps.