@Account Closed That is the first good reason given in this forum. However, I would counter with the following:
[1] The people who feel uncomfortable renting the jeep probably would not consider it anyway.
I would not be telling them that they "have to" rent the jeep if they rent the place, but that they can if they do not have a 4x4 and it makes them more comfortable. Consider UPS and Penske rentals -- virtually none of the first time rentees have handled a box-truck before the keys to one of them are handed over, and they are FAR more difficult to adapt to if you have only driven your Toyota Carola up to that point. Yet, these giant companies do it with no hesitation (the same applies to ATV and bike rentals). Clearly, if they are doing this, there is a way to protect yourself from liability.
[2] It is upon me to safeguard myself from liability, and for the guest to decide what they are capable of and/or comfortable with.
I am not going to pre-emptively exclude an option just because some number of guests might be reckless -- by that logic, none of us should hazard our rentals by allowing guests in. These examples are no different from those you hear on a weekly basis unfamiliar with real estate, saying something like: "what if a guest sets fire to your house?", "What if they refuse to pay rent and won't leave", etc. The difference is, you all know what to do in these situations, and how to protect yourself from them.