If you will do a search on this forum you will find a huge amount of information on this subject. I use the rack from Camping World that attaches to the ladder. It is a real chore and pain to get the two bikes up and secure so we don't take them very often. I worried on my first trip that I would lose my rear picture window or, at the very least, the ladder. But, properly secured, they took the bumpy I-5 without a problem; just like others on the forum said they would. That said, using a hitch mounted bike rack would be my preference.