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Originally Posted by rmhornback
I need a work truck to put a Spartan Strongbox service body on. The body weighs 2950#. I need to tow a JLG Triple L utility trailer (UT610) that weighs 2,650# and has a capacity of 7,000#. I don't want to buy too little or too much- but where is the sweet spot?
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Common - but often overloaded with a loaded service body towing a 10,000 pound trailer - is the F-350 SRW. Let's run the numbers for a 2008 model.
For a "work truck", I'll assume SuperCab. More places to haul your "stuff". Even work truck drivers need elbow room. And if you order from scratch, you can order exactly what you need. You can choose between a pickup with no bed, or a real chassis cab truck. The Strongbox folks make the body for either one. I'll figure the pickup with no bed because I have the numbers handy.
F-350 SRW SuperCab longbed 4x4 PSD with 3.73 rear end:
GVWR = 11,500
GCWR = 23,000
Wet and loaded truck with driver but no bed = about 7,500 pounds. Bed = 3,000, so gross of 10,500. Hitch weight will be about `1,000 pounds, so now we're looking at 11,500 pounds and we don't have one ounce of stuff in the service body.
So forget the SRW.
F-350 DRW SuperCab longbed 4x4 PSD with 4.10 rear end:
The Dooley gives you 1,190 more pounds of payload, so you can haul some stuff in the service body. It depends on what you haul around in the service body, but 1,190 pounds ain't much. So I'd go up one more notch to the F-450.
The F-450 pickup is a luxury rig that comes only in CrewCab with aluminum wheels. You can order it in XL trim, but you cannot order the bed delete. So you'll have a pickup bed whether you want it or not. So for the F-450, I'd move over the the chassis cab truck. (Be sure your service body provider knows you'll have a chassis cab and not a pickup without a bed.)
F-450 SuperCab 4x4 PSD with 4.30 rear end and 60" cab-to-axle:
GVWR 16,000 pounds
GCWR 26,000 pounds
Wet and loaded truck with driver but no bed = about 8,500 pounds. Bed = 3,000, so gross of 11,500. Hitch weight will be about 1,000 pounds, so now we're looking at 12,500 pounds before we load the service body with stuff. That gives us up to 3,500 pounds of net payload for stuff in the service body. That should be plenty unless your payload is lead ingots or an awful lot of steel pipe fitings.
So assuming we're loaded to the gills at 16,000 pounds on the two truck axles, that leaves a max of 10,000 pounds for the trailer before we run out of GCWR.
You said the trailer has a "capacity" of 7,000 pounds, so assuming that means net payload of 7,000 pounds, that's almost 10,000 pounds for the gross weight of the trailer. So you'll be right at the limit of the 26,000 GCWR.
On the F-450, if your trailer might gross more than 10,000 pounds you can go for the High Capacity Trailer Tow pkg. That will give you 4,000 pounds more GCWR with automagic tranny, or 2,000 pounds more with stick shifter. The disadvantage is it comes only with 4.88 rear axle ratio. Without that pkg you can get the 4.30 rear axle ratio which is probably all you need if you don't overload the truck.
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How much payload could I carry in the service body?
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F-350 SRW = none
F-350 DRW = about 1,200 pounds
F-450 chassis cab = about 3,500 pounds
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I would like to stay away from a CDL if I can. Thanks for your help.
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Not my area of expertise, but I understand if you don't exceed 26,000 gross combined weight and the trailer doesn't exceed 10,000 pounds gross weight, then you don't need a CDL in most states.
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