I'm with North shore. All caulks will eventually fail, especially if your TC is stored out in the open against the elements, be they the effects of sun, rain, snow, or wind storms.

Therein lies the problem. I re caulk my old Lance about every 2-3 years, and it's a time consuming project even with forgiving Dicor that doesn't get any easier as I get older. I use both the runny/flowing on the roof seams and vents, and the side sticking version of Dicor. With a handful of wide, feathery tips, the job is easier.
It's just the preparation is much, much longer with silicone having to mechanically and chemically remove the stuff.
If you never plan on re caulking your TC, hey, use silicone with abandon.
jefe
p.s. i now have a TC barn to avoid snowfalls like the above.
