For 2003 F53 front wheel bearings, use high-quality lithium complex grease rated for wheel bearings, such as Valvoline MaxLife or Timken grease. Avoid mixing different grease types and follow the proper torque sequence: 30 ft-lbs, back off, then 17 in-lbs.
Ford E350 dually rims do have different center hole sizes - front wheels typically have smaller center holes (108mm) while rear wheels have larger holes (143mm). You likely purchased a front wheel rim when you need a rear wheel rim for your spare.
Rear ABS sensor at hub or differential depending on system. Remove wheel for access. Use penetrating oil on mounting bolt. Clean tone ring during service.
Off-center steering wheel fixed by adjusting tie rods equally both sides. Return to alignment shop if recently done - they should fix free.
Rear hub oil leak on F53 is axle seal failure. Oil on inside tire means seal is leaking diff fluid. Stop driving to prevent brake contamination. Repair involves pulling axle and replacing seal.
For a 2003 F53 chassis, kingpin wear should not exceed 0.005-0.008 inches of lateral play when properly measured. Any movement beyond this tolerance indicates worn bushings or kingpins requiring professional replacement for safety.
Avoid deep water with RVs. Water in engine causes catastrophic damage. Know air intake height. If crossed, check all fluids for water contamination.
Your 2016 Tiffin Allegro has an 8-lug Dana 17060s rear axle configuration that differs from standard Ford F53 specs. You'll need to source parts using the Dana axle part number or OEM Tiffin suppliers rather than Ford VIN lookup.