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Old 03-23-2016, 10:34 PM   #1
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Tow Rig Questions

So we have a f250 with diesel, and is rated at 15900 lbs towing and our fifth wheel is 9200 empty rated to 12000 and shows a pin weight of 1680. So here we go , I am considering a larger fuel tank but concerned about the weight. I cant find any where max pin weight for the truck. So I'm debating between doing a midship replacement tank or aux tank. The midship would be a 50 gal instead of the 26 gal tank. and aux the sky is the limit. Also if we do a aux tank how about storage? We use our truck mainly for the fifth wheel and not 200 more miles a month just driving with out 5er. So how would it store in big tank in the back over the winter. Thanks for the help in advance Jeremy
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Old 03-23-2016, 11:34 PM   #2
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Your max pin weight is what's left after you load your truck with everything you take camping. Your payload rating is listed on your drivers side door/jamb. It will be around 2200lbs+/-. If your dry pin is 1680lbs and you add the 5th hitch of around 175lbs that's 1855lbs. Now add propane and couple batteries at 150lbs total. Now you're up to 2005lbs. So only speculating here but you are about 150-200lbs away from the trucks GVWR. Add you and whoever and whatever else in the truck and chance are you're over the GVWR but several 100lbs.
So now you can start using the RAWR as a base since you have exhausted the GVWR. Next figure out what you will be loading into the front of the 5er as well as the under bed storage and anything else in front of the axles and add that to the 2005lbs. Guessing you're looking at 24-2500lbs all said and done.
Add that to your empty rear axle weight and that will tell you how close you are to your limits.
No MFG lists max pin weights. Pin weights are based on a % of the loaded trailer.
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Old 03-24-2016, 04:58 AM   #3
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Den... we would really need actual weights of the truck and trailer to give a full answer, however, know that 3/4 tons typically offer very little payload capacity... that is the exact reason I just traded mine in for a dually. Fuel is heavy, I would be very suprised if we could make the numbers work without being overloaded on GVWR and / or RAWR.
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Old 03-24-2016, 12:38 PM   #4
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Your pin weight can be as little as 2,400# and as much as 3,000# on that 12K RV. Dry weight numbers are USELESS!!!!!!!!
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Old 03-25-2016, 11:24 PM   #5
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Quote:
So we have a f250 with diesel, and is rated at 15900 lbs towing and our fifth wheel is 9200 empty rated to 12000 and shows a pin weight of 1680.
Tow rating, dry trailer weight, and dry pin weight are all useless info. You need wet and loaded pin weight. To get in the ball park, use 20% of 12,000. Or 2,400 pounds, then add 200 pounds for the weight of a good 5er hitch with install kit, total 2,600 pounds.

Quote:
I cant find any where max pin weight for the truck.
Reliable info not available unless you compute it yourself.

1. Load the truck with everybody and everything that will be in the truck when towing. People, pets, tools, campfire wood, jack and jack pad, whatever will be in the truck when towing except for the 5er hitch. (Or if you have the 5er hitch installed, then don’t add the 200 pounds to your pin weight.)

2. Drive to a truck stop that has a CAT scale and fill up with fuel. Then weigh the wet and loaded truck.

3. Add the weights on the front and rear axles of the truck to get gross vehicle weight (GVW).

4. Subtract the GVW from the GVWR of the truck. The answer is the unused payload capacity available for pin weight and other weight such as more fuel and heavier fuel tank(s). IOW, that’s your max pin weight for your tow vehicle loaded with you and yours.

5. Subtract your 2400 or 2600 pin weight from the max pin weight from 4 above, and the answer is the unused payload capacity available for more fuel and a heavy fuel tank.

Quote:
So I'm debating between doing a midship replacement tank or aux tank. The midship would be a 50 gal instead of the 26 gal tank. and aux the sky is the limit.[
No, the sky is not the limit when you begin with an F-250. Replacing your stock tank with the 50-gallon replacement tank would be the least additional weight. Steel auxiliary tanks are heavy, and alloy auxiliary tanks are expensive. So you pays your money and you takes your choice. But don’t plan on adding more than about a 40 gallon auxiliary tank because you don’t have the payload capacity for the sky. Look up the weight of diesel. Is it over 8 pounds per gallon? A 40-gallon tank full of diesel could easily weigh around 500 pounds. Do you have 500 pounds of payload capacity left after allowing for pin weight?


Quote:
Also if we do a aux tank how about storage? We use our truck mainly for the fifth wheel and not 200 more miles a month just driving with out 5er. So how would it store in big tank in the back over the winter. Thanks for the help in advance Jeremy
Water (condensation) is the enemy, so you don’t want any water contaminating the diesel. Either drain the tank completely empty before you store it, or else fill it up to the cap with fresh diesel. If you fill it up, then no moist air will be available to cause condensation. After you fill it to the cap, then don’t crank the engine again unless you have a can of diesel handy so you can top off the tank to the cap again. If you drain it, then before you fill it up with fuel again, be certain there is no water in the tank.
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