Any chance of posting pictures of your sagging slide? Your model year camper, a 2005, would have the newer bottom plastic coated slide floor system. It helped solve a problem of water getting into what was a plastic membrane covering bare OSB board which was on the pre-2005's.
However with the new plastic bottom coated floor, the ends of the slide floor can become water infected.
Need more info on what you are seeing to help better.
You asked about "Dicor rubber roof" and you will be using it, what Dicor product is this? Dicor makes many products for rubber roofs from the actual membrane, to lap sealants (caulk), to actual coatings you put on the roof to restore a worn white layer. Trying to help but do not know which product you are referring too.
Hope this helps
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
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