Yes Rubber with the age of your unit. Special order you could get aluminum. The older ones where Aluminum before they went to rubber.
For cleaning I use Tide laundry soap to cut the dirt.
For caulking see this post. You need to check for fine splits and cracks and fix now as soon as you find them. http://www.sunlineclub.com/forums/f7...1-a-11508.html
To treat the rubber if you want to, I use a product called 303 Aerospace UV Protectant after it is washed and dried. It is made to not hurt the rubber. Need to watch out that you do not use products with petroleum in it as it affects the rubber.
Also caution the roof is not a walk on roof again unless it was special order. In order to actually walk or kneel on the roof to service parts etc you need to put a carpet or tarp down to protect the rubber then pieces of 1/2" or thicker plywood on top to hold your weight that will span about 20" of more. The rafter are on 16" centers. Need to spread the load out. I use pieces of 2 foot x 4 foot x 5/8"
There is no support wood between the rafters normally. You will go right through if you try and stand on it between the rafters.
To wash I use a good step ladder and a long reach car wash pole brush. Then hang over the side to get 1/2 way and work yourself around the perimeter of the camper.
Hope this helps and good luck
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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