We have been using the spring curtain rod method for about 8 years now and have towed this Moble Suite 11 k miles and the previous Elite Suite close to 50 k miles with no door problems. We started using this method in 08 due to the door getting loose in our 38'TKSB3 the first time we pulled it and broke the bottom glass. We use as heavy duty a rod as we can find and they have alwayse stayed in place even on these extremely smooth
Interstates we have all over the country. The Dallas we now have has 3 pocket doors,one between the kitchen and bathroom and two that slide together from both sides between the bathroom and bedroom that requires a rod 41" long. I asked ED at the DRV factory when we were there a couple months ago if they had a fix for the doors getting loose when traveling and his reply was, "What we are doing using the spring curtain rods is working so continue". They have no other method that works better.