We have one of the bike racks were the bike dangles and bang into each other.

Its a mess.
We want to purchase something different. Something that uses the hitch on the back of my truck. A bike rack that holds 3 bikes, 4 on occasions. I don't want them banging into each other, and if possible, I don't want to mess around with taking the wheels off.
I seen some racks were the bikes sit on a platform.
Please help!! Feel free to include links please. We want to order something soon (this weekend)
Thank you very much...