Unless you are into boondocking more than a night or two at a time, go to a single battery. I did this a year or two ago for a significant weight loss.
On my Trailmanor, I planed some thickness from cabinet doors and drawer fronts to save a few pounds.
If your trailer is full of mirrors, remove the mirrors and replace them with lighter material. All that glass is surprisingly heavy. I went from 11 mirrors to just one. I used some cheap bamboo blinds that I bought on sale for $7 each and used spray adhesive to attach the material to the wood backing for the mirrors. Looks much like my friends vintage Limited that has caned inserts. See my 2005 Classic 28 thread for some photos.
I also traded the couch for two lightweight rocker-recliners. That had to have saved some weight since the couch is really heavy.
John W. Irwin
2005 Classic 28 "Sabre-Dog III"
2013 Silverado 2500HD Duramax/Allison LTZ
WBCCI #9632, TAC TX-10