What class hitch should I get to tow a 8000 lbs. Airstream trailer? I have a Ford F-150 pick up that will hau?

I have a Ford F-150 that will haul 8800 GVW and it has a trans. Cooler on it
Ratio is 3.73 5.4 V-8
2" receiver

If 8800 pounds is the GCWR then there's no way you can tow an 8000 pound trailer. GCWR is the *combined* weight of the truck, trailer and anything else you happen to be carrying. If the trailer is 8000 pounds, then that means the truck, the people in the truck, and any other cargo will have to weigh 800 pounds or less. Which is of course silly since the truck probably weighs close to 5000 pounds.

We need really to know the year model. You have to determine your Gross Combined Vehicle Weight for your year, cab configuration, and wheelbase. There are F-150's with 4.10's that can haul 15,000 GCVW. IIRC, the 3.73 package was good for around 13K- 13.5K, but your trailer weighs 8,800 and the truck is gonna be around 5,100-5,300 depending on whether it's an extended cab or SuperCrew. In actuality, I don't think you could shift enought weight to the steer axle with a weight-distributing hitch to get this thing anywhere near legal on the rear axle weight. My trailer and truck is right on the ragged edge of my GCVW and if the racecar or trailer were any heavier, I'd be screwed.

In North America there are a few common classes: I, II, III, IV that are defined by the SAE. Some manufacturers market Class V hitches, but there's no such thing according to SAE J684.
Class I - up to 2,000 pounds (910 kg) - light loads
Class II - up to 3,500 pounds (1,600 kg) - light loads
Class III - up to 5,000 pounds (2,300 kg) - larger loads (campers, boats, etc.) Class IV - up to 10,000 pounds (4,500 kg) - larger loads (campers, boats, etc.)