Upgraded springs, axles (5,000lb), and tires. Reinforced rear bumper with receiver hitch. Solar panels with inverter. Lithium ion batteries (2). Blue Ox load distribution. Backup/ rear view camera. A/C replaced last year. External power (30amp) surge protector, and water pressure regulator. Everything working well. Additional storage, organizers and hooks throughout. Carbon monoxide monitor. Master locks on propane and batteries. Outside doors and forward pass throughs rekeyed to common key. Lots of extras like fans, covers, tools and parts. Great floor plan in great condition!