Did 1980-1991 Ford F-250s and F-350s have short beds or only long beds? (RE-POST; Read the information and details)?

I know I've asked this question already, but I don't believe I'm getting valid answers. I know 1980-1991 Ford F-150s came with either long beds or short beds, but what about heavier duty F-250s and F-350s. I have searched for Ford F-250 and F-350s short beds on Google, but the beds on the F-250s and F-350s appear to be long beds. So Do F-250s or F-350s from the years 1980-1991 have short beds or only long beds? (I'm not talking about F-150s, I'm talking about Heavier F-250s and F-350s).

Is there a way to make alternative diesel from waste vegetable oil? (See details below)?

I was curious on if I could make alternative Diesel from filtered & de-watered used cooking oil if I mixed in these products (Listed Below) in to it.

I have 1985 Ford F250 Diesel. I'm also thinking about installing an HHO generator on my truck while I run the alternative diesel to make up for any lost horsepower.

Kerosene
Anti-gel product
Power Service products
- Diesel Kleen (grey)
- Clear Diesel (white)
- Diesel 911 (red)
HEET products
- HEET year round (yellow)
- ISO-HEET (red)

2019 Ford Superduty, electric trailer jack issue?

So I just bought a 2019 F-350. The trailer I use for work has an electric jack which will now not work with the new truck connected to it. It worked fine on the 2018 that I had. My co worker with his 2019 Chevy plugged into it and the jack works. I plugged into a different trailer with the same jack and it worked, but that trailer has an onboard battery on it, mine does not. Ford can't figure it out. I did find out that the jack will work once the truck it put into drive, but not park! Kind of hard to hook up a trailer with the truck in drive! Again, sounds very strange.

Thoughts?

My trailer repair place thinks the only way he can see a fix is to run a wire from the battery to the connector making it hot all of the time.

Ram truck resale/trade in value so low already?

So I own a 2018 Ram 3500 Laramie sport with a Cummins. It's filled decked out as well. My co worker bought a Ford F-350 lariat around the same time, has similar mileage and less bells and whistles as mine. I ran and compared our KBB trade in values and mine is down to 50k and his is still 58k. I paid 58k for mine and he paid 59k for his.

Why has mine dropped so much?