i made absolutely sure that my 2 car garage was more of a 2.5car garage before purchase. even asked the builder NOT to finish the walls cause that'll give me another 4.5" of clearance
per side.
that said, i have plenty of room to detail both my G and Z inside the garage. the G's bigger so difficult to work on the rear bumper without openening the garage door but no rain hits the cars unless a gust of wind. in our area we're required to have a step before the entrance to the house so i have a 3ft area where my workbench and tool cases are placed. even so, no issue opening the drawers. it took quite a bit of planning but well worth it....big bang for the buck for me.