I would not be concerned about using a pressure washer if used properly. As long as you so see damage inside or outside don't worry. My trailer is a 2005 and I just check the roof a couple times a year. I have read that these roofs may last 20 years.
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Russ and Linda, So. California
2004 Chevy Silverado 2500 HD, D/A, SRW, SB
2005 2955RL, Pullrite Superglide 16K hitch. Bridgestone Duravis R500 tires. EZ Flex Equilizers with wet bolts.EMS HW50C, Disk brakes
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