I took a look at the owner's manual for the Empire Faucets RV Shower Valve w/ Vacuum Breaker # EM62FR and you are correct, the small plastic cap that you turned clockwise to increase the temperature is the temperature adjustment mechanism.
Since you've already adjusted the temperature on the faucet itself, then I recommend next checking your water heater.
A common component for a water heater to insufficiently heat the water is a faulty thermostat. The thermostat controls the water heaters... view full answer...
Timken bearing kits are made in the USA and they are much more reliable than other options. So since we know you have a 7k axle on your Forest River Riverstone the correct kit would be the part # TMK22VR. view full answer...
I recommend using the MaxxFan Plus Roof Vent # MA00-04500K he MaxxFan 4900k is no longer in production. This is very similar as it has thermostatic control, remote control and rain sensor.
Adding the MaxxAir FanMate RV and Trailer Roof Vent Cover # MA00-955003 will allow you to still use the vent even in the rain. It will attach with the included clips so no drilling is required. It is smoke like the vent cover to allow light to still come in when closed. view full answer...
Lippert recently did away with the sticker and only has a small "notch" or "crease" on the shock to indicate the starting point for pressure on their Trailair Air Ride 5th Wheel Pin Box - Lippert 1621 & 1621HD - 21,000lbs # LC158778. Lippert recommends your air spring be inflated to 45-120psi. view full answer...