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Open Roads Forum  >  Towing

 > Upgrade to 5th wheel

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Cummins12V98

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Posted: 09/17/22 02:27pm Link  |  Quote  |  Print  |  Notify Moderator

GVWR is ONLY their licensing and to keep the truck in a certain classification. Stay at or under your axle ratings and all will be fine. Be sure your trucks tonnage covers the weight on it's tires.

If you add to over 12k you most likely will need bags.


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Lantley

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Posted: 09/17/22 02:30pm Link  |  Quote  |  Print  |  Notify Moderator

Cummins12V98 wrote:

Lantley wrote:

2112 wrote:

I calculate it this way:
6340-2840=3500lbs. This is your rear axle limit
3500-200=3300lbs. Subtract 200lbs for the hitch
12000 X 0.25=3000. Guesstimated pin weight if the 12,000lb trailer is loaded to the max

3300-3000=300. You have 300lb margin on your rear axle.

I thought the pin weight was taken at 20% of gross weight not 25%.
12000 x .20= 2400 3300-2400=900


Have you ever actually weighed your 5er fully loaded? Many are 25% pin as my last two DRV's have been.

You and I know DRV's are very nice rigs, however they are also heavier than most. I don't doubt DRV's have 25% pin weights but the OP was not referring to a DRV. I also imagine DRV are at least 5% heavier than most comparable size RV's.


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blt2ski

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Posted: 09/17/22 02:35pm Link  |  Quote  |  Print  |  Notify Moderator

IRRC from a previous post somewhere, I believe MA is like WA state, you need to buy tonnage for your pick up. Just make sure you have proper paid for gvw, ie higher than you actually wieght!
Other issue I don't know, not mentioned, you state RAWR is 6340 lbs. What is limiting factor? If it's the tires, there is nothing illegal or wrong about upsizing them when you need new ones to gain payload capacity, closer to you axle or spring capacity. Your door sticker won't be correct, at least where I am, LEO/CVEO's don't go by door sticker rating for how much I can weight. It's paid for registration.
I don't see any issues with what you want to tow. Be it true or civil legal issues.

Marty


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valhalla360

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Posted: 09/17/22 02:42pm Link  |  Quote  |  Print  |  Notify Moderator

At 14k GVWR, you are looking at a pin weight of 2800-3200lb by the time you load up and are ready to go out on a trip.

What does the yellow payload sticker on the door say? Pin weight along with passengers, gear, hitch, bolt on after market equipement...etc... all count against payload. Unless you are obsessive, I'm betting you are up close to 4000lb of payload used and most 3/4 ton trucks will be significantly over their limits.

Do people do it anyway? Sure. You will get people telling you that you can pull even more because they know better than the engineers. No ones going to pull you over, so ultimately, it's your call but if you want to stay within the ratings, I'll give you 10-1 odds you exceed them.


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Cptnvideo

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Posted: 09/17/22 02:46pm Link  |  Quote  |  Print  |  Notify Moderator

Aren't most 5th wheel trailers 8' wide?
And aren't most short bed pickups less than 4' from rear axle to cab?


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valhalla360

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Posted: 09/17/22 07:07pm Link  |  Quote  |  Print  |  Notify Moderator

Cptnvideo wrote:

Aren't most 5th wheel trailers 8' wide?
And aren't most short bed pickups less than 4' from rear axle to cab?


8.5 ft typically for larger 5ers.

Most newer 5ers have compensated:
- The front corners are radius'd to give a little more space before they would hit the truck cab.
- Most 5er pin boxes are extended out 18inches or so giving you more space to turn more sharply.
- You can get a slider hitch giving you more space.

Plus, you are presuming that you will get the trailer fully 90 degrees to the truck. Most of the time, you don't need to turn that sharply.

While I certainly prefer a long bed for 5er towing, a shortbed isn't the end of the world.

Cptnvideo

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Posted: 09/17/22 07:35pm Link  |  Quote  |  Print  |  Notify Moderator

We had to get the truck 90° to the trailer once. Glad we had a long bed.
But I understand a sliding hitch does the same for a short bed.

Cummins12V98

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Posted: 09/18/22 07:59am Link  |  Quote  |  Print  |  Notify Moderator

"8.5 ft typically for larger 5ers."

Don't think your statement is factual. Many large 5er's are 8'. The more expensive units are 8.5' but they are far and few.

Cummins12V98

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Posted: 09/18/22 08:00am Link  |  Quote  |  Print  |  Notify Moderator

Cptnvideo wrote:

We had to get the truck 90° to the trailer once. Glad we had a long bed.
But I understand a sliding hitch does the same for a short bed.


LongBed = NO COMPROMISE!!!

jjj

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Posted: 09/18/22 08:42am Link  |  Quote  |  Print  |  Notify Moderator

I always go with the gvw and not the built weight.
You will slowly start adding more things when you
start using it and will find out you will start
getting close to your gvw before you know it.
Just like tires always fill to the max air, I go
by the GVW. Just my 2 cents. That is how I do it.
Good luck on your new fiver.


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