If you're looking for a bike rack for two bikes, I recommend the Allen Sports 4-Slot Bike Rack. Unfortunately, if you have 4 bikes, Allen does not have an 8 slot bike rack. Simple rule? Take the total number of bikes that the rack can hold, divide by two, and you get the number of bikes that can fit on the rack. In other words, if you don't want to fight the devil every time you want to take your bikes somewhere, I'd recommend a roomier bike rack. Seriously, you should be able to fit four bikes on a 4-slot bike rack, but expect trouble. In addition, bikes with a frame smaller than 17.5 inches will not fit in a luggage rack. Also note that crossing bikes (front wheel on the left, front wheel of the next bike on the right, etc.) is not possible. Finally, where the hitch connects to the receiver, there isn't a simple pin and clamp, but an anti-rattle nut and bolt that you have to tighten and loosen every time you want to remove the rack. As a layman, I would recommend a roomier bike, even if it costs a little more money.
Efficient Hitch Mount Platform 2-Bike Rack: MAXXHAUL 50027 for Easy Bike Transport
12 Review
Universal SUV Car Top Luggage Holder With Extension - XCAR Roof Rack Carrier Basket Rooftop Cargo Carrier, Black, 64"X 39"X 6
14 Review
MotorFansClub Roof Rack Cross Bars For Jeep Cherokee 2014-2019 | Aluminum Cargo Luggage Rail (Not Compatible With Grand Cherokee)
26 Review
CURT Hitch Cargo Carrier - 60 X 20-Inch Basket With 500 Lbs Capacity, Black Steel, 2-In Folding Shank
42 Review