AHA! Actually went out and did some online RESEARCH
re: tire covers ...
" ...UV rays speed the aging process of your tires, which can lead to dry rot or premature cracks in the sidewalls... The sun's UV rays can ruin your tires while the vehicle is sitting
, when they are more susceptible to sun damage because they get little use. Normal driving causes your tires to heat up and flex, which maintains the tire's built-in UV protection ..."
From the Goodyear site (which has an extensive RV tire section):
located at Goodyear RV Tires
"RVIA (Recreational Vehicle Industry Association) says, ”Statistics indicate that the average life of an RV tire is five to seven years. "
Replacement - more frequent usage will result in longer life.
Weather cracking is common in RV tires from all manufacturers.
Appears as crazing and or cracking in the flex area of the sidewall
Probable causes of sidewall weathering
— Long periods of inactivity or storage
— Direct exposure to air and sunlight
— Exposure to high levels of ozone (smog, electrical generators)
— Excessive washing or dressing using alcohol or petroleum based cleaners
To combat weather cracking and dry rot, Goodyear uses anti-oxidants and anti-ozonants not only in the tire sidewall but in the tire casing as well. These anti-oxidants and anti-ozonants slowly make their way through to the sidewall to keep the sidewall looking great for many, many years. Anti-oxidants and anti-ozonants protect the tire from ozone, UV light, and sunlight.
As far as making the tire look shiny, there are a variety of products on the market today. We do not recommend or endorse any specific product. Just stay away from any petroleum based product
which can react to the rubber.