Bought our first TT this month.
Upgraded from a used PU many years ago, then graduated to tents for many years. Thought it was time to not have to deal with putting away wet tents and stuff. Seems it always rained when packing up.
Have made several improvements already. Wire shelving in closets and cabinet. Dividers in under-bed storage. Removed under sink dividers and made new ones that give more storage space. Made a larger entrance step that attaches to original. Added screen door bar, screens over outside small openings, bath vent cover, and struts to hold open upper cabinets.
Thanks to some of the suggestions by others here.
Have gone on a couple short outings this month, getting ready for a long trip this fall.