Originally Posted by RFryer
Bankr63, doesn't the Arvika A-Frame mount only have 1 central vertical support? Your pics show 1 on each side of the frame.
The "3rd arm" is an option available with their bigger racks and attaches the front of the bike rack to the A frame up near the coupler for more stability. Recommended for more than 2 bikes, but we only have a 2 bike carrier. I am not sure if it could be adapted for a non-Arvika rack or not; depends on how it attaches at the rack end. I would think it would probably only work with a tray style rack though; a hanging rack won't have anything to attach to.
Again, I have their 2" receiver rack, their bike racks share the same mounting components but the top of the rack would be different, and the bikes will ride closer in to the trailer.