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Old 02-26-2018, 10:31 AM   #1
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New to 5th wheel trailer

Pulling 18,000lbs 5th wheel 40ft. What type of truck do I need?
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Old 02-26-2018, 10:33 AM   #2
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at least a 1 ton dually. You could go 450 and be happy.

you could go medium duty cab and be VERY happy.
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Old 02-26-2018, 10:43 AM   #3
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I was told a 350 with 3:55 will pull it
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Old 02-26-2018, 11:01 AM   #4
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New to 5th wheel trailer

18000 is kind of that area where a DRW starts to be a real necessity. You're looking at 3600 pounds of pin weight plus a couple of hundred for the hitch. That's pushing it for a SRW diesel (which you'll likely want to get the GCWR up high enough.)

The 2017 Lariat 350 I looked at had a payload of 3152...6.7, crew cab, long bed, FW prep, moon roof (about the heaviest 350 SRW out there but still). The dealer told me the payload of that truck was 7000 pounds. Yikes. I didn't buy a truck from that guy.

Don't fear the dually!
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Old 02-26-2018, 11:08 AM   #5
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Quote:
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I was told a 350 with 3:55 will pull it
It will pull it.. it just won't support it too well. The extra two sets of tires (and brakes) add vertical support and braking power.

It's all about the payload and braking. Be sure to check the sticker in the door jamb of any truck you consider. Options, like 4 wheel drive, sunroofs, stuff like that, eat into the available payload.

Maxing your payload doesn't break the truck, but it does make the ride worse and more dangerous as you've limited the trucks rear end capacity for helping control the trailers roll, pitch and yaw. Although 5ths don't typically sway, but when they lean, they can still pull the rear end around and too much vertical weight can help unload the front tires..

Take the payload number less the pin weight, less everything else you'll put in the truck, including people and hitch.
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Old 02-26-2018, 11:11 AM   #6
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Another resource
RV Tow Check | Before You Buy RV Calculator
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Old 02-26-2018, 01:31 PM   #7
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I would want a 450 for that load.
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Old 02-26-2018, 02:10 PM   #8
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I was told a 350 with 3:55 will pull it
Yes a DRW w/3.55.
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Old 02-26-2018, 02:14 PM   #9
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You'll need a diesel and at least 3.73 gears to climb hills. I pull a 19,000 toy hauler with my dually Duramax with ease.
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Old 02-26-2018, 04:59 PM   #10
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Pulling 18,000lbs 5th wheel 40ft. What type of truck do I need?
As others mentioned you will run out of payload before you exceed the tow ratings. A rule of thumb is 20% of the rig GVWR which in this case is 3600 lbs. of hitch weight. This doesn't include passengers, extra stuff, luggage etc. Whatever you do don't skimp on the tow vehicle. Most find out the hard way that 1/2 won't work, 3/4 may work but marginal on only certain 5th wheels, 1 ton is the best option and for a rig this big a dually TV is highly recommended and the 450 is definitely on the list.

Best advise is choose wisely and don't be afraid of the larger tow vehicles. You won't be sorry and it will end up being much cheaper than going through the other lower weight capable trucks.
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Old 02-26-2018, 07:22 PM   #11
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You don't need a 450, the payload capability is actually less than a 350 due to the heavier axle, brakes and 19.5 wheels and tries. My 17' DRW F350 CC Lariat has payload rating is 5279.

https://youtu.be/I6RIJrwu9AM
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Old 02-26-2018, 08:18 PM   #12
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Thanks,what’s the big difference between the 350 & 450?
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Old 02-26-2018, 08:43 PM   #13
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Surely FOMOCO enthusiasts will go on, but basically the 450 has a wide stance front axle allowing the steering wheels to turn slightly more before frame interference. This allows for a slightly improved truck turning radius.
The newest models may have other benefits.
As others note, "pulling" is only a portion of the formula. Payload, stability, etc. at 18K lbs. you'll not likely complain about having too much truck.
Be well
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Old 02-26-2018, 08:59 PM   #14
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Get a dually! All three make good trucks. Don't get stuck on Brand . Just get what suits you best .
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