Newmar motorhomes on Freightliner chassis can experience rough rides due to improper ride height adjustment, incorrect air pressure settings, or suspension component wear. Most issues can be resolved through proper air bag calibration, shock absorber maintenance, and ride height adjustments.
For RV applications, Femco valves are generally preferred over Fumoto due to their more compact, low-profile design that reduces road debris damage risk. The Femco's recessed valve mechanism and optional protective cap provide better protection in RV environments.
RV refrigerator glass shelves slide during travel due to inadequate shelf supports or worn shelf clips. Install shelf retainers, rubber strips, or adjustable shelf guards to keep shelves secure while maintaining easy removal for cleaning.
E-450 front squeak - identify when it occurs. Braking squeak is brakes. Over bumps is suspension. Check bushings, ball joints, and brake wear indicators.
ZF front suspension on Tiffin Breeze has known shock inadequacy. Koni upgrade from Tiffin helps significantly. If still bottoming, add Sumo Springs as progressive bump stops. Check for worn bushings, ball joints, and verify front axle is not overloaded.
Replace missing F53 bump stop with Ford OEM or polyurethane aftermarket part. Consider helper spring upgrade for better performance. Check other side - they often fail together.
This sounds like a main electrical supply issue, likely from your shore power connection or inverter system. The E7 codes and simultaneous failures point to insufficient power reaching your high-draw appliances.