I have the same setup on my Lance 1685. push up on the tabs and pull the flap open at the same time. You need 3 hands to do this...lol. They're very stiff when new. My first time I thought I was going to snap the tabs off. I'm going to spray a little sillicone spray on the tabs to see if it gets easier .
Too funny. We took our new TT for its maiden voyage this past weekend and that is the only problem we had. I felt really dumb calling my dealer to ask them how the heck to get it open when we returned, as I tried every which way and was really afraid to break the darn thing. He told me they just flip down, and are tight when new. I will try it again this weekend. Great post!
Mike, Kim, and Pepper (Min Pin security)
2012 Jayco Eagle Super Lite 308RETS, TST 507 TPMS
2010 Chevy 2500HD, Duramax/Allison, 2WD, Long Bed, Crew Cab, Duraflaps, AMP Bedstep
Equal-i-zer 1400/14K Hitch