Can't help with the first 2, but #3, check out MorRyde's TV mounts, they make quite a variety for basements. #4, they do make the hose with fittings. Should have came with at least the fitting. One of our RV's came with just the fitting, our SB came with the hose and all.
John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.