Spend the $15 and buy a tube of caulk. Hit that bottom seam that several posters have mentioned. I had a slide leak this year and would have sworn that the caulk on that seam was good. After running out of options I reluctantly followed the suggestion of others and caulked that seam... If for no other reason to prove them wrong... Turns out they were right.
If you consider the movement of water, that seam particularly on a rig with slide toppers is really the only area that water will flow too during all levels of precipitation.
Griswald One - Life is a Misadventure!
2015 Greyhawk 29ME / Chevy Sonic