your challenges should be similar to ones you face in everyday life in a S&B, other than the added challenge of new places.
I really think you could make modifications to a RV the same as you would a house. do you have a cell phone that will do captions? (not sure if they exist).. you may find making reservations at some places challenging (some parks don't do online reservations). communications with other people who don't understand hearing impairments will be your biggest challenge.
I am sure you can get alarms with flashing lights, I would contact a good alarm installation company and talk to them about your needs. I know I had a second siren with flashing light put in mom's house after she set her alarm off several times without realizing and didn't hear phone calls because she hadn't put her hearing aids in when she got up.