I have Bigfoot levelers on my 31' Class C. I'm a 67 yo woman who most often is traveling by herself. I had the levelers installed at the manufacturer's place of business in MI one or two years after purchasing my C new. There is no way I could physically crawl under or bend under to place blocks. I would never have another RV of this length without levelers. Yes, they were expensive, but so worth it to me and my situation. YMMV