I love this rack! It is bombproof! I also have a 1UP Super Duty. I bought the VelociRax 5X because the other rack was very "floppy" with 4 bikes and I needed to carry 5 bikes. The VelociRax 5X makes loading very simple, the bikes do not touch anywhere, and they are very stable, even on rough roads. I also took a trip from Texas to Utah and back and had the VelociRax on the back of my travel trailer with 5 mountain biles, with no issues. It was secure and worked great! The only problems were not with the VelociRax 5X itself. The bands they sell to lock your brakes tend to break. Use velcro cable ties instead. And, before our trip to Utah, I sent a text to their customer service (per the website's information) because I was interested in purchasing the narrower VelociRax 5 cross bars for my travel trailer. Never got a response. The last thought is that this rack is very heavy! It'll take two people to safely mount it to your receiver. Small price to pay for the convenience and security this rack provides.