Thank for the replies. I have about 3 doors that lift up and they have two gas struts per door. I have struts with 80 pounds pressure each. These are the doors I use most that seem to wear out the fastest: water/sewage, batteries and propane. They start to sag and I have to keep pushing them up, only to have them start dropping. I always replace both when I change them out. Always worse in the winter. Is there a better name brand that I should be looking for? WildeBill, is there a moderator for this site that can help me add my coach to my profile? I have a 2000 National RV Tradewind 37' Class A.