Originally Posted by
Igualmente
On Yakima's website there is discussion of this. There are a some models that handle 4 bikes. The FAQ's for these (eg for the Ridgeback 4) discuss the class of receiver you need (under some conditions only class 1, apparently). There are also downloadable instructions that might say more.
Keep in mind that 4 heavy bikes (40lbs each?) and a 35 to 40lbs rack is 195-200lbs. Maybe use class II to be safe, but I'd be surprised if Class 3 was needed.
My existing hitch rack can handle 4 bikes. I am more concerned as you mentioned with 120lbs of bike plus 30 lbs of the hitch still being to much for a class 2. From a pure tongue weight perspective not a big deal, but the set back weight and the air pushing on it while driving is a concern. All the vehicles I've seen with 4 bikes on it are large vehicles such as my dad's full size pick up growing up.