Your concerns about gravel storage are valid - moisture retention and weed growth can cause issues. Weed barrier fabric under your RV is a better solution than tarps, combined with proper drainage and regular maintenance.
You can replace just the fabric on most RV slide toppers without replacing the entire assembly. The fabric typically costs $50-150 and can be installed in 2-3 hours with basic tools.
The Ford F53 chassis with Godzilla V8 has improved power but still uses the same basic suspension design as previous models, which often requires aftermarket upgrades for optimal handling and ride quality in Class A motorhomes over 30 feet.
Motor should run in Store mode for HWH jacks. If jacks extend but not retract, likely the retract solenoid valve or its wiring. Spring replacement should not affect hydraulic function unless lines were disturbed. Contact HWH for technical support.
HWH control panel issues often stem from corroded connections or worn switches. Clean connectors first, then consider membrane switch replacement before buying a new $400-800 panel.
When RV leveling jacks have no power, check the main disconnect breaker, battery connections, and hidden fuses in the engine bay or basement compartments. Battery polarity issues are rare but can cause system failures.
A spinning handle on a stuck-down stabilizer jack typically indicates stripped internal gears or a broken drive mechanism. This can often be fixed by accessing the jack's internal components and replacing worn gears or tightening loose connections.
Heavy brackets stored under sofa are likely spare parts for slides, jacks, or furniture mounts. Photograph with measurements and post to RV forums for identification by your make/model.
Knockoff Sumo Springs can work for light-duty RV applications but genuine Sumo Springs offer superior materials, warranty, and safety. Consider your RV's weight, usage patterns, and budget when choosing between options.
Kwikee steps stuck retracted with amber light usually indicates motor failure or linkage bind. Check 12V at motor first. If power present but no movement, replace motor. Lubricate linkage as preventive maintenance.
For low-mileage RV use like yours (1200 miles annually), fuel filters should be changed every 2-3 years rather than annually. The LFF1003 and LF5488 filters you mentioned are critical for engine protection and should be inspected yearly for contamination signs.