I do cover my wheels, and have done so for a long time. I do it to keep the tires and wheels clean. And it's not a bad idea, according to the Michelin tire web site on tire care.
AGING, WEATHER CHECKING, AND
OZONE CRACKING
During the pre-trip inspection, be sure to check the
tires for signs of aging, weather checking, and/or ozone
cracking ? these show up as tiny cracks in the rubber
surface on the sidewall of the tire. If the cracks are less
than 1⁄32? deep, the tire is fine to run. Between 1⁄32?
and 2⁄ 32?, the tire is suspect and should be examined by
the Michelin dealer. If the cracks are any deeper than
2⁄ 32?, the tire should be replaced immediately.
Here are a few tips to help you protect the tires from
these common damage conditions:
1) Keep the tires properly inflated.
2) Keep the tires clean.
3) Avoid prolonged exposure to heat, cold, or moisture.
4) Avoid prolonged exposure to ultraviolet rays.
5) Cover the tires when the vehicle is not in use.
6) Do not park near electric generators or transformers.
7) Do not store vehicle in an area where welding is being
done or in a garage that has mercury vapor lamps.
LONG TERM STORAGE OF RV TIRES
Unless the RV owner is a full-time RV-er, the vehicle
probably spends some time in long-term storage. But
what the RV owner probably didn?t know is that rubber
tires age when not being used. So, if the owner must store
the RV, a cool, dry, sealed garage is the best bet. Also,
some storage surfaces can cause tires to age faster. That?s
why Michelin recommends placing a barrier (cardboard,
plastic or plywood) between the tire and the storage
surface.
Here are some other steps the RV owner can take to
help reduce the aging effects from long-term storage:
1) Thoroughly clean tires with soap and water before
placing into storage.
2) Cover tires to block direct sunlight and ultraviolet
rays.
3) Store out of a high ozone area.
Note: When a vehicle is stored, tires should be inflated
to the inflation pressure indicated on the sidewall.
Before removing the vehicle from long-term storage,
thoroughly inspect each tire ? this includes sidewalls,
tread area, and pressure. If the tires have lost pressure, be
sure to inflate them to the correct pressure before driving.
PROPER CLEANING OF RV TIRES
Like the rest of the RV, it pays to keep the MICHELIN?
tires clean. Road oil will cause deterioration of the rubber,
and dirt buildup will hold the contaminants next to the tire.
As with the cleaning of any rubber product, proper
cleaning methods must be used to obtain the maximum
years of service from the tires. A soft brush and the
normal mild soap that you would use to clean the RV
may be used. If you use a dressing product to ?protect?
the tires from aging, use extra care and caution. Tire
dressings that contain petroleum products, alcohol,
or silicones will cause deterioration or cracking and
accelerate the aging process.
In many cases, it is not the dressing itself that can be
a problem, but rather the chemical reaction that the
product can have with the antioxidant in the tire. Heat
can add to the negative reaction. When these same
dressing products are used on a passenger car tire that is
replaced every three to four years, it is rare to see a major
problem. However, in most cases, RV tires may last much
longer due to limited annual mileage, and the chemical
reactions have much longer to take place.
TIRE REPAIR
Even the best drivers can drive over a nail, and the best
tires can pick up that nail or screw and go flat. If you pick
up an object that causes a flat with a Michelin?
RV tire, the
repair must be made to the inside of the tire to be repaired
properly. To do this, the tire needs to be demounted and
inspected on the inside of the casing for any other damage
that the object may have caused. See the MICHELIN? truck
tire dealer for the proper repair and damage inspection.
TIRE INSPECTION
The MICHELIN? RV tires should be inspected
thoroughly at least once a year, and any time the owner
drives in rough or rocky terrain, or when the owner is
having their RV serviced. This inspection should include
both sidewalls, the tread area, and the valves, caps, and
any valve extensions. Inspect for nails, cuts, bulges, aging,
or fatigue cracks and weathering or ozone cracking. Also,
check between the duals for objects lodged between
them. See the Michelin dealer at once if anything
unusual is observed.
On a regular basis, rub the palm of your hand across the
face of the tread on your front tires to feel for any feathered
wear from ?toe? alignment problems. NOTE: Be careful
since severe wear can expose steel belt edges that are very
sharp. A ?toe? misalignment problem can be caused by
impact with a ?chuck? hole in the road. Bad ?toe? wear can
be hard to find visually, but can be felt very quickly with
the hand. This type of alignment problem can wear rubber
off the tread of the tires in just a few hundred miles.