Sounds like he is looking for a Wash and Wax type product (to rubbing).
I would think any Name brand "Wash n Wax" would be fine but your best results will be with a wipe on, wipe off wax/polish.
Everyone has their own opinions on the "best" wax or polish. I have used Reject and NuFinish with great results. I have also tried about every brand name on the market over the years (even some at $30+). Some are harder to apply and others are harder to remove. Not sure if any of them stood out as the best.
I always pick a syntethic wax (not carnuba) because it will last much longer.
Just pick what you like in the price range you want and you will be fine. Its sure a lot better than doing nothing to protect your RV.
Be carefull around your sticker / graphics. If you wax by hand they say to avoid them.
2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, Fresh water surge tank, Black Tank Tornado flush, 4999 zip ties.