These are products I use in my own RV and recommend to my clients:
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Surge Protector (Power Watchdog is our favorite): Every rig should have one when connected to shore power! Hughes Autoformers Power Watchdog is the most advanced RV surge protector on the market. Bluetooth connectivity lets you monitor power use and power issues in realtime. The Emergency Power Off (EPO) function anticipates power issues and cuts power to the RV to protect onboard electronics. And if a massive surge damages you Watchdog, the internal surge module can be replaced without replacing the entire unit. The Power Watchdog with EPO is available in 50 Amp and 30 Amp, as well as non-EPO and hardwired options. Use discount code DAVIDSMOBILE10 for 10% off your purchase!
Surge Protector (budget-friendly option). Every rig should have one when connected to shore power. Progressive Industries 50 Amp (SSP-50XL) or 30 Amp (SSP-30XL) are quick and easy to install, and have a lifetime warranty.
Dehumidifier. A must-have in high-humidity locations like the pacific northwest. We use this hOmeLabs 1,500 square foot dehumidifier in our own RV, and it’s worked great. Don’t keep it too close to your pets’ water bowls, or they’ll be dry by morning.
Unique Camping + Marine (store link): Tons of great products for holding tanks. We especially love the RV Digest-It Holding Tank Treatment (pour this into the toilet with just a few gallons of water before hitting the road and let the bumps break down the “poop pyramid!”) and the Flush-It 2-in-1 RV Toilet Cleaner and Tank Drop-In Pods.
Happy Campers Holding Tank Treatments. Environmentally-friendly odor control for black and gray tanks without added perfumes or masking scents: 18 treatments or 64 treatments. (Not available in California.)
Water Pressure Regulator. Water pressure can fluctuate wildly from park to park, and even from day to day within a park. A regulator can prevent water leaks and avoid costly repairs.
3M Command Hooks. Hang anything anywhere with all kinds of Command Hooks, without damaging (most) interior surfaces.
Water Filtration System: 2 stage or 3 stage. Most park water is safe, but this will offer more protection and your water will taste better.
RVLock Keyless Entry. Replace your door’s deadbolt with this keyless entry system and never forget your keys again.
Tire Pressure Monitoring System (TPMS). I’ve been using a TST 507 system with cap sensors (replaces valve stem caps, not mounted inside the tire) for temperature and pressure monitoring of RV tires while on the road.