Yep, we've done it for years, and I know of quite a few other people that do as well. It's kind of the cheap home remedy version, but it works just as well as anything else I've ever seen. You're basically putting a greasy type product on the front of the camper, so the love bugs don't get a chance to "stick" to the camper/car/etc... As long as you're sure to wash it off whenever you get where you're going, you'll be fine!
I don't think anything can guarantee that you'll get every single little bug mark off, but the products listed in this thread will definitely help in reducing the majority of your work.