I have used a ADCO Tyvek on my old trailer for years. I personally like them. My old trailer was aluminum sided and never had any problems. This year we bought a 3006w. Needed a new cover as new trailer is 4 feet longer. I picked up a new ADCO cover during the CW sale. It fits well they have made a few improvements since my last one. Its obviously has loose material up front with the V nose but was a 1/5 of the cost of a custom cut to fit one. I don't expect any problems over the rainy season. Hope my two cents help.
2012 WindJammer 3006W
2013 Chevy Duramax 2500 HD LT Crew Cab Z71
2013 Chevy Suburan 2500 LT 4X2
Camping is my hobby