Hi. The ramps can be used on Class Cs, and I have used mine once. I also carry the Lynx blocks and use them mostly. I guess what you use will depend on the spot where you are camping. I used the ramps when I knew I had to bring up the front end a little and the same amount on each side. That is not often the case for me. I've been in spots where I needed to block up 3 wheels to get level. So for us, the spot dictates what I will use. Some RVers will use lumber to block. Remember that both wheels of the duals on one side need to be blocked up, and always remember that there must always be one wheel solidly on the ground for safety. Good luck and happy travels in your new to you unit. Bob