I am trying to calculate the largest trailer I can tow with my 99 F250 PSD Ext Cab 8’ bed with a 373 axle.
If I understand things correctly then the GVW of my Truck is 8800. Ford set the GVCW at 20,000.
So the largest trailer I can have is predetermined at 20,000-8,800 = 11,200 lbs GVW.
My truck with me and full tank is approximately 7,000 lbs.
I want a gooseneck trailer so the toung or bed weight is about 20% of the overall trailer weight. Is that correct?
If so then I am limited by my payload of 8800-7000 or 1800 lbs. Or a 9,000 lb loaded trailer (9,000 * 20%) = 1,800.
So in reality I can legally be maxed out at a 9,000 lb GVW trailer?

I did some more research and in PA if the GVW of the Trailer is GREATER than 10,000 lbs then you need a Class A CDL.
And if the Gross Combination weight is over 17,000 lbs you need a medical card..

So at at 8800+9000 = 17,800 lbs I would need a medical card.

I want the largest legal trailer my truck can handle.
Does this sound correct?