Super Antenna MP1LX Tripod HF 40m-10m Portable Antenna with Go Bags for ham

Can you use a antenna tuner when using a power linear ?

work in the rain ?

Can i just unpack, put it on the roof when using the cb and then bring it back in and put in bag when i am not using any longer?

I have an 11’ peak in my attic. Does any section telescope allowing it to stay below that? Also will radials work when laid on wood flooring?