Why do some vans have four rear tires?
So you were driving down the freeway the other day and you got behind a van a truck it looked a little…weird. You counted and there were one, two, three, four rear tires! Why build a thick truck with two Cs? Simply put, more rear tires equals more payload capacity.
How much weight can a tire support?
Each tire has a tested load index. For modern radial tires, this can exceed a ton for each tire. Think about it, some light duty pickups with just four tires have a GVWR of over 8,000 pounds.
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That said, there is an upper limit to how much weight each tire can hold. And the faster you plan to go, the less weight you can put on each tire. Additionally, some municipalities trying to preserve their roads limit the weight you can place on each tire.
With some heavy-duty pickup towing capacities over 18,000 pounds, two rear tires just won’t cut it. For this reason, all Detroit Three offer heavy-duty trucks with dual rear tires.
Curious to know how much weight a single tire can support? Learn more about how car manufacturers choose and evaluate tire load ratings.
What are vans with four rear tires called?
To get a pickup truck with four rear tires, you must order the dual rear wheel configuration. Most pickup truck fans call these rugged rigs “duallys”.
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You cannot order a full-size light truck with dual rear wheels (think F-150 or equivalent). But you can get dual rear wheels on the heavier trucks offered by the Detroit Three. This includes the Ford Super Duty series, the Ram 3500 and up, and the mechanically identical Chevrolet Silverado 3500 and GMC Sierra 3500 from General Motors.
Are there any disadvantages to dual rear tyres?
There are several reasons why you might want to think twice before buying a heavy duty truck with dual rear tires. The most common concern is the higher initial cost and higher maintenance cost of a “double” truck.
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Most car manufacturers will charge you at least $2,000 more to assemble your heavy truck with dual rear tires. This double truck has a regular rear axle and brakes, but it has four rims and four rear tires. It also has specially designed and wider rear fenders. All of these components cost the automaker money.
You also need to consider the cost of replacing these tires. When your tires are finally bald, you can’t just order four, you’ll need a set of six tires. If you live in a snowy state and want to invest in separate winter tires, you’ll also pay extra for this set.
A double truck is also wider than a regular truck. The difference is not too extreme. But if you do a lot of off-roading on tight trails or squeeze into tight parking spaces, you might want to reconsider ordering a dual truck.
Finally, there are rare cases where you will have to pay a higher toll for your “commercial grade” truck with its dual rear wheels. In most cases you will only pay the two-axle toll, but not always. There are even a few parkways in residential neighborhoods that don’t allow “commercial grade” trucks with dual rear axles.
Next, find out why some vans have a lock box in their bed.
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