Silverado 1500 Tires for Towing a Boat in Florida

Ramp day is a tire test

A Saturday at the boat ramp asks a lot of a pickup. The truck pulls a loaded trailer down I-595 in July heat, backs onto a hot, wet, salty ramp, then pulls the boat out and does it all again in reverse. A Silverado 1500 is built for that work, but its tires are the part carrying the extra weight.

We don't rank brands, and we don't quote towing capacities; those come from Chevrolet for your exact truck. This guide covers what changes for tires when you tow, and how to choose a replacement set for a truck that pulls a boat.

Where the trailer's weight goes

A trailer doesn't just follow the truck. Part of its weight presses down on the hitch. Chevrolet's trailering guide calls this tongue weight: the downward force of the coupler on the hitch, which for conventional towing should be 10% to 15% of the loaded trailer weight.

That weight lands mostly on the rear axle, on top of whatever is already in the bed. So when you tow:

• The rear tires carry more than they do on a normal commute.
• Correct pressure matters more, because pressure is part of how a tire carries load.
• Your passengers, coolers and gear all count too.

Chevrolet's guide also points you to the Trailering Information Label on the doorframe of the Silverado 1500, which lists the weight figures for your specific truck. Read that before you hitch up, and keep within it.

Pressure: the label and the manual decide

The Silverado owner's manual explains that the Tire and Loading Information label shows the correct cold inflation pressures, which represent the minimum air pressure needed to support the vehicle's maximum load carrying capacity.

How to use that on ramp day:

1. Check cold, before you leave the house. NHTSA recommends checking pressure before long trips, before carrying heavy loads and before towing a trailer.
2. Use the label and the manual's towing section, not a number from a forum. If the manual says nothing changes for towing, nothing changes.
3. Never exceed the sidewall maximum. That number is a limit, not a target.

See how pressure moves with temperature on a hot day:

Choosing replacement tires for a towing truck

Federal standard FMVSS No. 110 requires that the load on each tire at the vehicle's maximum load not exceed the tire's maximum load rating, and it's why the door label lists the original tire size and pressures. Your replacement set should respect the same numbers.

• Load index at or above the original. Michelin explains that the load index is the most weight a tire can carry when inflated properly. Never go below what came on the truck.
• Speed rating at or above the original, for the same reason.
• P-metric or LT, compared like for like. Many 1500s come on P-metric tires. LT tires are built for heavier loads and use different pressures. Our LT vs P-metric guide and our F-150 post explain the trade-off, which applies to the Silverado too.
• Tread for your real driving. If the truck tows a few weekends a month and commutes the rest, a highway or all-terrain tread that suits pavement and rain is usually the better fit.

Check any tire's numbers against your truck:

The full load and speed checker works with any size, and our load index guide explains the chart.

Heat, ramps and salt

South Florida adds three things to the towing checklist.

Heat. NHTSA explains that underinflation, excessive speed and overloading can all cause heat build-up in a tire. A loaded trailer on summer asphalt stacks those risks, which is why the cold pressure check matters more here than almost anywhere.

Wet ramps. Ramps can be steep and slick, especially near the waterline, and that's where worn tread shows first. Measure the rear tires' tread in a main groove, and plan to replace before the wear bars, not at them.

Salt water. Backing a trailer into the bay puts salt water on the trailer's wheels and splashes the truck's. Rinsing the wheels and trailer with fresh water after a launch is a cheap habit. Our post on salt water and wheels covers what salt does to metal.

The spare, for the truck and the boat

A flat on the way to the ramp is twice the problem with a trailer attached. Before boating season:

• Check the truck's spare for pressure and age; it can be as old as the truck.
• Know how to lower it. Many pickups store the spare under the bed on a winch; try it at home before you need it on a ramp road.
• Carry the right tools for both the truck and the trailer; the lug nuts may not match.

Don't forget the trailer's tires

The trailer has its own tires, and they're a different category from the truck's, often marked ST. Their size, load and pressure come from the trailer's label or the trailer maker's manual, not from the truck.

Boat trailers often sit for weeks between trips, sometimes in full sun. Before each season:

• Check pressure cold against the trailer's label.
• Read the date code. Our DOT date code guide shows how. Tires age even when the tread looks new.
• Look at the sidewalls for cracking, bulges and cuts from ramp edges.
• Check the trailer's spare, if it has one.

The towing checklist

When it's time for a new set, shop by size and compare load indexes before price. Running a work fleet as well? See commercial tires. Shipping is free to the 48 contiguous states and DC, and in Miami-Dade, Broward and Palm Beach we install at our Sunrise shop or by mobile van.