We use Scott's. It's a tad more expensive than others...but has larger rolls, they tout 100 sheets per roll. It has septic tank use printed on the packaging. When the kids were home, one of my peeves was too run out of TP. I used to buy Scott's by the case (100) from our local grocer--- he cut me a good price for a case, I saved money, we had plenty of room to store 50 rolls under each bathroom vanity and we were all happy! 
Yes, I would love the exterior trailer lights used as decorative ones! I'm a sucker for bling--- our home has two artificial trees either side of the front door, with 100 tiny lights on each ---- and landscape lighting all down the front flower beds as well. They run on timers and are on every morning and every afternoon at dark-thirty. Love them!! 
Enjoy your day, happy RVing dreaming/planning!!
Joella