Tire Weight Rating Questions

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Question:

On a two wheel car dolly, is the load weight the sum of both tires together or the weight rating on the tire? For example, 1,500 lbs load max times both tires equal 3,000 lbs load max for the trailer?

asked by: Rob

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Expert Reply:

A tire's weight rating is per tire. For example Roadmaster Tow Dolly with Electric Brakes 4,250 lbs # RM-2050-1, uses # RM-200330-80 tires which has a maximum load capacity of 1,570 lbs each. With 2 tires used, the load capacity of the tires doubles to 3,140 lbs. Since the # RM-2050-1 has an overall load capacity of 4,250, if you subtract the load capacity of the tires, 1110 lbs is the left over towing capacity of the tow dolly itself.

Overall, the dolly's capacity is not equal to the same as the weight capacity of both tires. The other weight is on the actual tow vehicle, also known as tongue weight. Trailer tires can be rated for less than what the trailer weighs because 10-15% of the trailer's weight is the tongue weight is placed on the tow vehicle via the hitch.

expert reply by: Timothy G

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Answer 1

There is only a very slight size difference between the ST215/75R14 and the ST205/75R14 that you currently have on your trailer. The difference is less than half an inch in overall diameter less than half an inch in additional width. You would want…

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Answer 2

Usually customers will use a couple of L-brackets, such as #PF775-BKT-2, to mount a replacement fender. You would need to drill holes in the fender so the studs on the trailer can go through. Then attach the brackets. I included a picture showing an…

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Answer 3

Yes, the narrower ST205-75R14 tire will fit in place of an ST215-75R14, It is important for all of the trailer tires to be the same size and construction type (bias ply or radial). Using different sizes can cause tracking problems and lead to…

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Answer 4

Radials are the way to go for highway use like you said you'd be using your dolly with. For a 13 inch trailer tire that's a radial the Karrier Tire part #AM10210 which is a size ST175/80R13 would be a great option. It has a capacity of 1,610…

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Answer 5

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 6

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 7

Hey Andrew! Yes, Furrion does have a Chill Cube model with a heat pump. This was actually just released for aftermarket sale. You will need a complete system to make the switch, new R32 units aren't backwards compatible with old R410A systems.…

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Answer 8

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 9

According to Blue Ox, it'll take an experienced installer about 4 to 5 hours to complete the installation of their #BX1128 Base Plate Kit on a 2016 Jeep Grand Cherokee. The install isn't what I'd call super-difficult, but the installation…

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Answer 10

Thanks for the pics Kemo, they really helped! The CE Smith Single Axle Trailer Fenders #CE19504-2 are larger than what you currently have and use a different mounting style. Based on your setup, the CE Smith Fenders wouldn’t bolt onto your existing…

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