RV LIFE Forum Hub, Wander The West
Low Cost Mods
This isn't a mod per se, but I picked up a combo belt/bottle opener and haven't travelled without it since! $12 in some places online, I got mine - which should still be under $25 - at REI with a gift certificate, so in my case it was free.
Says 'unisex' but fyi for anyone looking I found it...