Hey,
I rented Jeep Wrangler from Royal in August 2005. The car was kind of shaky while driving on the flat road, I had a bad feeling about the car, I asked Royal to give me another car, because I felt it was unsafe for the off-road, the following day they brought in brand new Jeep Wrangler which was much better and felt safer. Anyways, I do not recommend you renting Jeep Wrangler, because there are better 4x4 you can rent in Aruba. Royal is a good rental agency, they are accomodating and reasonable. I rented from them via Bucuti resort front desk.
Would I be renting from them again? Probably, also depends on the price I guess.