MP Metal Protector - AMSOIL Metal Protector (MP) is an easy-to-use spray-on product that protects metal surfaces, displaces water and silences squeaks. MP cuts through rust and corrosion to restore free movement of “frozen” hardware parts. Doesn't form gum or sludge. AMSOIL MP is the product of choice for drying electrical and ignition systems and protecting electrical equipment from freshwater and saltwater damage. AMSOIL MP is also the product of choice for protecting firearms and other fine components. It contains no silicone. AMSOIL MP is compatible with plastic, leather, fabric, fishing line and paint.(AMP)

We have used it to free up the door lock on our 5th wheel, lubricate the fold down steps and prevent rust from spreading underneath. We keep a can on board and have helped out the ranger at Shenandoah National Park free up sticky locks and file cabinets.
          

MPHD Heavy Duty Metal Protector - A heavy duty spray lubricant fortified with special rust and corrosion inhibitors. Penetrates and adheres to metal surfaces, leaving a long lasting protective coating. Apply MPHD to any metal surface that requires a heavy duty lubricant or is exposed to the damaging effects of salt, moisture or chemical erosion. Works as an undercoat, leaving a wax-like film. Recommended for motorcycle chains. Won't "sling" off. Dry to the touch. Doesn't attract dust. (AMH)

We use it to protect metal underneath the RV, to keep things from rusting and we keep a can in the fifth wheel.

Synthetic Multi-Purpose Grease, NLGI #2 - reduces friction and wear in high-speed, high-temperature components such as automotive wheel bearings and electric motors. Keeps components running clean and trouble free for outstanding performance and long-life. NLGI #2 is the primary recommendation for wheel bearings . (GLC).

Don't forget the trailer wheel bearings.

BriteSide Miracle Wash - A unique dry car wash that delivers outstanding performance and quick, easy, economical application. Its special formulation lifts dirt, holds it in suspension and shields surfaces from abrasion.
Miracle Wash repels dust and light dirt and protects automotive finishes from the sun’s ultraviolet rays. Great for those little clean up jobs at parks an campgrounds. (AMW).