here's a very strong recomendation for Yakima. It's much more stable than the Thule, I think much better built. Taking the front wheel off... helps with stablity and you can get put the wheel up on top too... For my money it's a Yakima hands down
I have two Yakima King Cobra bike racks for my Jeep. You don't have to take the front tire off and they support many different wheel sizes. It has been a great rack for me and I would recomend it to anyone.