most important is street tires.
Good street tires that will hold a Cobra on the rain soaked street. I use BFG G-Forces tires. I have no trouble driving on the interstate at 70 in heavy rain. The G-Force tires do their job.
When it rains, just lean forward and drive faster.
That lets the rain blow over you. You will need a baseball cap to keep you hair dry.
RainX both sides of the windshield because the back side gets just as wet as the front. Keep a rag to wipe the back side of the windshield. I have raincoats behind the seats but I have never used them.
We have pulled into the covered gas station and waited till the rain passed. But most of the time we keep going because you can drive out of the rain storm.
Don't let the threat of rain keep you in the garage.
Dwight