Ive got an 81 f-350 dually 4.9 flatbed. I plan on installing some hydraulics to make it a lift bed.
I like it!
My 74 F-350 "White Ox" has an electric-powered hydraulic scissor hoist that I use frequently around the farm.
I always figured that I would need to upgrade my alternator/battery setup, but after several decades of steady use I probably won't bother.
It still has a 65 Amp alternator driven by a single belt and a single Walmart regular-duty battery and stock sized cables.
HOWEVER, when I raise or lower the hoist, I ALWAYS rev the engine up to ~2000 RPM to ensure that the alternator is carrying as much of the load as possible.
I haven't even licensed this truck for 3 years now so it never leaves the home place. It rarely gets out of granny gear or reverse nowadays, so it doesn't get extensive driving to charge the battery. I just did the annual oil change last week and it totaled exactly 55 miles in just over one year. I have never needed to put an external charger on it and it starts right up (this little 300 starts with VERY little cranking).
I used to used Optima batteries in everything and they used to be quite good, but in the last ten years I have been very disappointed with them. I will probably never buy another Optima battery.
Do bear in mind that my usage is quite different than most folks, and I am never very far from help if I do have a failure.
Your mileage may vary.
Good luck on your project.