If you ever have a slide come out when going down the highway at 60 + MPH you will start using the locks. One morning as we were breaking camp and the wife was putting in the bedroom slide she said it made a weird noise, not hearing it, I really didn't think much of it. Later we were headed East on I-80 and I passed a semi as I was looking to go back into my lane all I saw was white.. The noise she had heard when the slide went in was the shear pin shearing off which let the slide move out since I didn't have slide locks at that time. I sure do now and use them all the time. Just remember to remove them before opening the slides.
Rich