#### DW_Gray

##### Well-known member

Okay, I’ve read enough RV related forum comments and viewed enough RV dealers’ websites to cause me to want to rant. Rather, I’ve come up with a better approach. I’m about to revise my article,

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My personal opinion is that all the websites that attempt to assist RVers with estimating towing weight is entirely the wrong approach. Estimating is just that, estimating. I recommend you not waste your time with weight estimation. You have to use numbers that actually mean something. In connection with towing weight safety the five most important numbers you should use are Maximum Trailer Weight (sometimes call Maximum Loaded Trailer Weight), Gross Vehicle Weight Rating (GVWR), Gross Combined Weight Rating (GCWR), Gross Vehicle Weight (GVW) and a new term I present to the RV industry,

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Most RV trailer websites list the hitch weight of the trailer they're selling. That listed hitch weight is based on the trailer's dry weight. You and I know that no RVer will be towing a dry RV to a campground. Actually, you can never be sure of the true dry weight unless you weighed it at the nearest truck scale. Using the dry weight and hitch weight provides little value to knowing if you're looking at a safe towing weight combination. This new second equation is calculating the trailer's

5th Wheel/Gooseneck Towing: Trailer GVWR X 25 percent (.25) = GHWR

Example: 5th Wheel/Gooseneck Trailer GVWR: 18,000 X .25 = 4,500 GHWR

Once you've calculated your trailer's GHWR you need to ensure your truck can tow this amount of weight by not exceeding the truck's rear Gross Axle Weight Rating (GAWR).

Some vehicle brochures or owner's manual or towing guides will show the curb weight of the rear axle. Unfortunately these listed weights are not realistic. Therefore I recommend you weigh your truck's rear axle at the nearest scale to obtain an accurate rear axle weight. To ensure your rear axle can safely tow the trailer's GHWR, perform the following calculation formula.

(GHWR + Rear Axle Weight) - Rear GAWR = (A

Okay, here's an about-face. Above I said "Honestly, there isn’t any need for a specific calculator to assist you with knowing how much your vehicle can tow." I've changed my mind. I'm currently working a on new calculator that will simplify the above information and have you input some real data, not estimates, that help you know before you buy.

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*Before You Buy That RV, Truck or Other Tow Vehicle*, by adding a second equation that is overlooked by many RVers. The reason for this second equation is that some trucks have a high GCWR but the pin weight of the trailer will exceed the truck's rear GAWR. Before I do, I’d like some constructive feedback. Below are the draft paragraphs I intend to add to the article. If you that have time, please read and try some of my new calculation formulas. I may not be the smartest dude on this forum, but my goal is to provide information that will assist in educated decision making.~

My personal opinion is that all the websites that attempt to assist RVers with estimating towing weight is entirely the wrong approach. Estimating is just that, estimating. I recommend you not waste your time with weight estimation. You have to use numbers that actually mean something. In connection with towing weight safety the five most important numbers you should use are Maximum Trailer Weight (sometimes call Maximum Loaded Trailer Weight), Gross Vehicle Weight Rating (GVWR), Gross Combined Weight Rating (GCWR), Gross Vehicle Weight (GVW) and a new term I present to the RV industry,

**Gross Hitch Weight Rating**(GHWR). I'll explain more about the new term below.~

**MORE ON TRUCK REAR AXLE GROSS WEIGHT**Most RV trailer websites list the hitch weight of the trailer they're selling. That listed hitch weight is based on the trailer's dry weight. You and I know that no RVer will be towing a dry RV to a campground. Actually, you can never be sure of the true dry weight unless you weighed it at the nearest truck scale. Using the dry weight and hitch weight provides little value to knowing if you're looking at a safe towing weight combination. This new second equation is calculating the trailer's

**Gross Hitch Weight Rating (GHWR)**. This is the most weight that any trailer should be pressing down vertically on the tow vehicle hitch or on the rear axle. Below is the calculation formula to obtain the Gross Hitch Weight Rating (GHWR) for 5th wheel or gooseneck trailers.5th Wheel/Gooseneck Towing: Trailer GVWR X 25 percent (.25) = GHWR

Example: 5th Wheel/Gooseneck Trailer GVWR: 18,000 X .25 = 4,500 GHWR

Once you've calculated your trailer's GHWR you need to ensure your truck can tow this amount of weight by not exceeding the truck's rear Gross Axle Weight Rating (GAWR).

__5th Wheel/Gooseneck Towing__Some vehicle brochures or owner's manual or towing guides will show the curb weight of the rear axle. Unfortunately these listed weights are not realistic. Therefore I recommend you weigh your truck's rear axle at the nearest scale to obtain an accurate rear axle weight. To ensure your rear axle can safely tow the trailer's GHWR, perform the following calculation formula.

(GHWR + Rear Axle Weight) - Rear GAWR = (A

**negative is good**and you're under GAWR) (A**positive is bad**and you're over GAWR)Okay, here's an about-face. Above I said "Honestly, there isn’t any need for a specific calculator to assist you with knowing how much your vehicle can tow." I've changed my mind. I'm currently working a on new calculator that will simplify the above information and have you input some real data, not estimates, that help you know before you buy.

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