When i was planning our vacation last year, i had to figure out a way to carry 5 bikes. They make a 5 bike carrier but it was $$$$ and i had heard putting 5 bikes would be quite difficult anyway. It was suggested i look into a front hitch and that was the winner. I carried 2 bikes up front and 3 in the rear. Both bike racks were picked up on craigsist/letgo and I paid less than $150 for both! (plus $140 for front hitch) Both racks are older and discontinued but work well so search the classifieds! At least you'll spend less if you find you don't like it. The 2 bike rack required the adapter to 2". I haven't had any problems with it thus far.
Front Rack - Thule Roadway 2 bike
Rear Rack - Thule Trailblazer 4 bike
Here are some pics of the setup. Visibility isn't bad but I do remove the front seats to make the wife "happy". I also included screenshots of video from my dashcam. Headlight output does not seem to be affected. I still use the 2 bike rack on the front with one bike on any given day. People give me funny looks but i like it and it's convenient. I can get in and out of the back as needed.



view w/ seat

night view

view w/o seat

Photo taken from driver's seat (was only trying to get sign but should give you an idea of what to expect.)

rear rack

rear rack w/bikes

rear rack swing
