Of course, I use a tripod for LF, but rarely with my Mamiya 7. If I would use the Mamiya for shots I usually take LF, I would for sure use it on a tripod as well. However, I usually use the Mamiya when LF is not feasible. In these cases, extreme sharpness is usually not required. But I'm rarely dissatisfied with the sharpness of a hand-held Mamiya 7!
You may perhaps consider a monopod for your Mamiya.