I had an older copy of this but lost it. The thing that I was interested in since I don't tow is I wanted curb weights and option weights.

A fellow member (thanks billfires!) was so nice to be able to decipher what I was talking about and went through a little trouble to send me this. It has options weights in there so hours of fun calculating and playing "what if?" I'm just putting a google drive link for the pdf.

In Ford's words:

Accessory Reserve Capacity (ARC) Calculation
This section provides the information needed to calculate the effect that vehicle options have on the payload capacity of Ford light trucks.

This information is useful to customers who plan to add aftermarket accessories or haul cargo at or near the vehicle’s maximum capacity.

This section includes charts for each series, listing the maximum allowable weights for each GVWR.

https://drive.google.com/file/d/1-Qp...ew?usp=sharing

 

I have a 2018 (likely very slightly different in weight) but I would say that's pretty close.

We know Ford calculates the weight and adds a small fudge factor (to cover any tolerance stack) and subtracts from GVWR to get Payload..

Calculated from the table:
Calculated Curb Weight - 5056
Calculated Payload - 1944

Actual:
CAT Scale Weight - 5040
Payload Sticker - 1907
GVWR - 7000

I suspect the allowance for tolerance stack is around 1% of Curb but can't prove it.

5043 - Ford Calculation Software.(Estimate)
50 - Tolerance Stack Allowance (1%)
1907 - Payload Sticker
7000 - Total (Equal to GVWR)

So if I was guessing I came up about 13 lb heavy on my truck.

 

I was going to ask you CAT scales accuracy or resolution and I found this:
https://fifthwheelst.com/commercial-...ghing-rvs.html

 

Racing Corner Scales read within 10 lb of the CAT scale which only has a resolution of 20 lb. However I didn't put the corner scale weight because it isn't state certified.

The weight is generally accurate within it's resolution comparing the CAT Scale we use to the weight of our race car to NHRA certified scales.

 

Can someone explain to me exactly what this Accessory Reserve Capacity (ARC) is telling us?

I see Ford documentation stating "maximum allowable weight for regular production options (OPT) and aftermarket equipment"

On the particular trim I'm looking at the ARC is listed at 846lbs.

But what I'm not understanding is what this 846 is telling me. Wouldn't any production options and aftermarket equipment just be subtracted from maximum available payload? If maximum available payload is 1830, then wouldn't I have (ignoring axle weight limits etc) 1830lbs that I could put towards production and aftermarket equipment?

Is ARC just telling me the maximum possible weights if I checked every single option and aftermarket box when ordering a truck? So in effect 1830-846 = 984lbs would be your absolute worst-case rated payload?

Just when I think I understand all the weights and capacities I come across this one....