fpresto - I was making two trips a month from VA to Wichita Falls TX pulling my OFF-ROAD POPUP. Not liking the big roads I always take the lessor traveled road with no big trucks if possible... I was running I59 in North ALA out of Chattanooga and hit this 50-60 mile stretch of concrete road that had a buckle every eight feet. My poor POPUP was coming off the ground no matter how slow I would go... After a couple of trips I noticed my air conditioner was leaking some and found those four long screws loose. Had to re-tighten... My Air conditioner was so loose on top it was scary - I have no idea why I didnt lose it... All of those bumps sure did loosen up those bolts. After I got thru that part I would do my re-tightening and then head on my way...
Even the big trucks would run down the side of the road for those 50-60 miles...
Roy Ken