Stop in for a cup of coffee

So a 93 old flat bed fixed and reinforced to hold 8 people all painted up pretty and not perfect just trying to match the rest of the truck. I should be able to mount it back on the truck tomorrow and then have to figure out the bar stool seats and have no idea the size of an old tractor seat from center to sides. I want them to swivel and be adjustable to fit tall and short people.
Think my biggest problem would be someone that's over 300 pounds sitting on a seat . I weigh 140 wet and with my clothes on so hard to figure if the seats will hold up to heavy weight.
The truck is a 1.5 ton truck so think that will be fine and need to check the tires for weight capacities but the only time it will be driven with a bunch of guys on the seats is when I meet up with all of you guys and one of you gets a wild hair and decide to take all us bar stool setters for a ride around the car shows. Still that would be fun and looking forward in it as long as we can hold on to our drinks and not fall off. LOL

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I made a set of forks for my 3 point on my tractor. 2x2 square 1/8” wall tubing. I have lifted lots of things to test the limits of them, never bent yet. My son’s snowmobile is 700 lbs.
i have a steel tractor seat, could measure it. If i renember