In my opinion, the II's aren't worth the extra $$. Both do the exact same thing. The manufacturer makes it sound like they're sooo much better than the regular cover. When it comes down to it, air is entering the same size hole into the TT. I just don't see spending the extra money when it can be used for other things. Like beer.
2013 Jayco Eagle 328 RLTS
2012 Ford F250 6.2L 4x4 CCSB W/Air Lift air bags
2002 Coleman Bayside Elite (traded)
Me, Momma and Charles (RIP buddy)
And introducing Sofie!! ;)