Water is never good inside your TT. I have checked the roof of my slide out after I pulled It in during a rain. It has small puddles of water in low places on the roof. When you travel this water will come down and get the floor wet. As long as you dry it up the first chance you get, I would say with in 24 hours you should be ok. It is best If you can avoid closing it when the roof has water standing on it.
Pine cones, sticks, anything that can damage the gaskets is a bad thing. Even if a stick doesnít damage the gasket but keeps the gasket from sealing it could be bad. Say you are driving home in a pouring rain. This could allow your TT to get flooded with water and you wouldnít even know it, till you opened it the next time.
Leaves are not a big deal if it is not too many.
Several years ago. You would always see awnings attached to the slide that covered the roof protecting it from things like this. They are automatic and go in and out with the side. I am going to put one of these on my TT soon. I just donít understand why I donít see them as often anymore.
TV 2017 Chevy Silverado 6.2
TT 2018 Forest River 261 BHS
Be safe and Happy Camping.