Hello - The Hybrid Bike carrier will allow a Fat Tire Bike with the use of a Fat Bike Adaptor, part # RBCA033 (sold separately).
Hello, yes you can purchase 3 of these, you would need to make sure you have the proper space on the load bars to carry three bikes.
Hello, This bike carrier can fit on any crossbars that are 3 inches wide and 1.5 inches tall. We unfortunately have not tested this bike carrier to work on factory crossbars, so we cannot confirm this fitment.
This bike rack uses underside straps to install to a crossbar system. Your vehicle's factory rack should be able to use this, but the best fit would be with one of our roof rack systems. We recommend checking out this system on our website before purchasing, and looking through the instructions to confirm for yourself if this will fit. https://www.rhinorack.com/en-us/products/sport-leisure/bike-carriers/roof/hybrid-bike-carrier_rbc050