My 228BH has dual 27 Deka Deep Cycle Marines (23 Amp ave; 200 min). When I replace them it will be with Optima marine deep cycles; primarily since I use them on my off-road vehicles). However, if you have a generator, you can recharge batteries every day.
I honestly think the dual batteries on mine, with my Honda generator has been an overkill. When camping in the middle of nowhere, I can run the generator when I'm there with no problem.
As for interior lights? My 228 uses 921 in the interior, but not sure if your bulbs would be the same.
This place seems to have decent prices for the 921. I haven't ordered any yet, but will in a month.
921 LED, 260 Lumens, Warm White, 10-30vdc - RV-LED.com