I added one on the drivers side and it helped a lot. My bottom convex mirror was partialy blocked by a home made screen that I installed with a pass thru for tolls etc. Now I can see very close to the coach and more distant with the topper. Glad I did it.
Dave
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2004 37B Adventurer, 8.1 WH, Ultrapower, DIY CAI, Henderson Track Bar, Tru Center, Koni FSD's, Roadmaster Even Brake, Scan Guage II, 180 Thermostat,
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