Address to use for Solar Energy Credit for full time RVer?

We sold our house in 2022 and moved full time into our motorhome. We subsequently install a Solar PV system in the motorhome. I understand that we are eligible for the solar energy credit, but form 5695 wants the address where the system is installed.  Since this is for a motorhome, and we no longer own a fixed home, what address should I use?

 

1. The address on my driver's license? (This is still our prior house address)?

2. Our mailing address? (we are using a relative to handle our mail. If I use her address would that prevent her from making solar improvements on her house?

 

Thanks!