I doubt that you will find anyone that will rent a groover out. They are expensive and can be forgotten at camp or come back not clean. Most people won't want to deal with that hassle. If I were you I would just pick up a 5 gallon bucket with a gamma lid or get an old 20mm Ammo Can from an army navy surplus store. Either is cheap and legal on MFS. Good Luck.
Canyon Voyages in Moab is a short distance out of your way and rents them. Not gonna be cheap for the extra days. Might just make sense to buy one if renting for a week at that rate. CV are good folks though.
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