The bail fit the standard width US TP rolls. I am not sure what the maximum diameter TP roll is today to comment on how well it will work with MEGA rolls.
Yes, it will certainly attach to the side of your tub!
You can purchase replacement hardware kits on our site. The part number is PB20-1
It can be removed with torsion (see this removal video online). For a finished wood vanity it may be difficult to remove the adhesive without damaging the finish of your vanity. If the vanity is laminate, it is quite easy to clean with no damage.
The bar or bail can be reversed by loosening the set screw and flipping the bail left or right and then tighten the set screw back.
We carry a hand polished stainless steel cover plate for glass doors which has a pel and stick UHB adhesive backing. Part number is CR2RD-POL
To mount any of the LOXX series bath accessories on dry wall you will use the optional DW20 patented dry wall adapter. This is a single anchor, non directional wall adapter that installs using just a screwdriver. It still requires a hole in the dry wall but no drilling or other tools needed other than a screwdriver. This is rated at 45lbs as well. Because it has only one anchor (all others are two), the dry wall is much stronger as there is no chance for tear out.
I used on clear glass you will see a round white circle on the back side of the glass. We do offer a peel and stick stainless steel plate which installs on the back side of the glass to cover the hardware.