The rental agreement is clear that the deck is stacked in their favor.
LIMITATION OF USE AND RESPONSIBILITY FOR LOSS OR DAMAGE. Only persons signing or otherwise identified in this agreement will operate the Rented Unit(s). Other vehicles or equipment and passengers will not be carried on any Rented Unit. UTV passengers under 18 must provide XXXX with written consent from a parent/guardian. Should any undersigned person, or any minor child, or any other person with permission operate any vehicle or equipment in a manner that results in theft, loss of or damage to such vehicle or equipment, the undersigned agree to be jointly and severally liable for all such loss or damage, regardless of the forfeit of any damage deposit. The undersigned agree to pay for the loss of use of any Rented Unit or other vehicle covered by this agreement which becomes damaged at the daily rentals rate from the date of damage until repaired and placed back in rental service, not to exceed 30 days. The undersigned authorizes XXXX to charge the credit card provided as part of this transaction for any additional rental, damage, and loss of use charges that are incurred under the terms of this agreement.
30 Days of "loss of use" = $18k. Renter has no protection. Ride within your means kids, but that's out the window once a bunch of young guys start to amp each other up.