Hi Nick
Did you get your seal problem sorted out?
I "think" I know what you are saying, it is that the slide seal has fell down in the corner. Is that right?
On my 2004 unit the slide seal is screw in place by 4 screws. On each end of the slide, the seal is going up and down now, there is a small screw on the bottom and one up towards the top.
One is buried up in this area
Like right here
and down at the bottom like right here
Does yours have those screws and am I understanding the problem you are having right?
Hope this helps
John
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2004 Sunline T310SR
2005 Ford F350 Lariat, V10 with 4.10
CC, Short Bed. Integrated Brake Controller
Reese HP trunnion bar hitch with HP DC