Ramp door leak and water damage

[lrmike]

I discovered a major issue with my Sundance toyhauler this week and wanted to add a cross post here to see if I can get some constructive input. Heartland only produced 1 toyhauler in the Sundance line, the 330RC, and my issue is with the ramp door sealing. I've posted the topic in the Sundance section, but since most of them are straight up 5vr's I'd like some experienced eyes from the Cyclone group to give me some advise too.

Please take a minute and check it out here:
//heartlandowners.org/showthread.php/23093-Water-leak-and-now-a-major-floor-replacement