RV tire care in Florida heat: age and pressure matter more than tread.

An RV tire leads a harder life in Florida than the mileage suggests. It carries a heavy load, often sits parked for months at a resort or in storage, bakes on hot pavement and in direct sun, and then is asked to run at highway speed on I-75 or the Turnpike on departure day. Failures that look sudden usually are not — they are the end of a long, quiet aging process you can inspect for if you know where to look.

Start with the date code, not the tread

• Find the DOT date code on the sidewall. The last four digits of the DOT code give the week and year the tire was made — for example, a code ending in 2319 was made in week 23 of 2019. Check every tire, including the spare; spares age in the carrier just as surely as the tires on the ground.
• Judge replacement by age and condition, with guidance from the tire maker. Tire and RV manufacturers publish their own age guidance, and it varies — follow the guidance for your specific tire rather than a rule of thumb from the internet. A tire that is within its age window but cracked or damaged is not fine, and a tire past its maker’s guidance is not made fine by deep tread.
• Look for sidewall checking and cracking. Fine cracks in the sidewall, discoloration, and a dry, chalky look are sun and ozone at work. Deep cracks, bulges, or any visible cord are stop-and-replace findings, not watch-and-wait ones.
• Inspect the valve stems too. Stems age and crack on the same schedule as the tire, and a stem failure loses air just as fast as a puncture. Flex each stem gently and look for cracking at the base.

Pressure: set it cold, set it to the placard

• Check pressure cold, before driving. Pressure rises as a tire warms up, so a reading taken after a drive — or after the sun has baked one side of the rig all afternoon — is not the number to set by. Morning, before travel, is the honest reading.
• Use the RV maker’s placard and the tire load table, not the sidewall maximum alone. The correct pressure depends on the load each tire is actually carrying. If you have weighed your rig by wheel position, use that; if not, the vehicle placard is the starting point your tire shop or tech can help you refine.
• Under-inflation is the quiet killer in heat. A soft tire flexes more, builds more internal heat, and heat is what breaks a tire down from the inside on a hot highway. Over-inflation has its own costs — a harsher ride and uneven wear — which is why the goal is the correct pressure, not the highest.
• Recheck after parked stretches. Tires lose air slowly over time. A rig that sat through the summer in storage should never roll on the pressures it was parked with — checking them is part of the snowbird arrival checklist, not an optional extra.

Parked rigs: protecting tires that are not moving

• Cover tires that sit in the sun. Light-colored tire covers block the UV that dries and cracks sidewalls. On a rig parked at a resort or storage lot for months, covers are one of the cheapest forms of protection there is.
• Park on a clean, level surface where you can. Standing water, oil-soaked ground, and sharp gravel all work against a parked tire. If the rig will sit on grass or dirt through the rainy season, boards or pads under the tires keep them out of standing water and mud.
• Do not park at low pressure. Inflate to the proper pressure before a long sit, and recheck on any visit to the rig. A tire that goes flat in storage can be damaged by the rig’s weight resting on the folded sidewall.
• Level without overloading one corner. How the rig sits affects how its weight is shared. Our guide to the house systems covers the parked-rig picture more broadly — tires are one part of a rig that is meant to be checked as a whole.

Before any travel day

• Walk all the way around and look at every sidewall, inside duals included — use a flashlight for the inner tires.
• Check pressures cold, including the spare, and confirm the spare is usable, not just present.
• Look for objects in the tread, uneven wear that suggests an alignment or bearing issue, and lug nuts that are present and tight.
• After the first stretch of driving, a stop to look and carefully feel for one tire running noticeably hotter than the others can catch a dragging brake or a failing bearing early — if something feels wrong, get it checked rather than pushing on.

If a check turns up cracking, a bulge, or a tire past its maker’s age guidance, that is a replacement conversation with a tire shop — tires themselves are not a mobile-tech repair. But a tech visit for another issue is a good time to ask for a second set of eyes on what you found.

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By Josh Tomlinson — Josh operates Florida Mobile RV Service and writes these guides. About the service →

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