no you don't have to replace them.. at least in my coach, they are adjustable... each roller has 2 bolts on the top that adjust height. BTW, the height adjustment doesn't seem to be that critical.
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[SIGPIC][/SIGPIC]Hugh 'n Deb - USAF Retired B-52 Pilot
2004 Safari Zanzibar 40', F-150, BlueOx TowBar, SMI AF1
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