Dicor Lap Sealant White 10.3 FL.OZ. $10.49 at Amazon.com. That is likely what you saw at Camping World for around $14.00.
Dicor is also available in a "self leveling" formula for flat surfaces. Silicone caulk is not the best (imo) and is very hard to remove. The clay stuff works and is easy to remove but does pick up dirt a lot. I have used them all and for now prefer Dicor even though it is more expensive than the silicone caulk at Walmart or Home Depot, etc.
2012 Rockwood Windjammer 3008 W
2007 Tundra Reg Cab 4X4 SR5 5.7L