There is no "calculation" needed. Common jackstand sizes are 2 ton, 3 ton, and 6 ton. I can give you concrete proof that a three ton jackstand can be bent by an F250 SC LB. So your next option is a 6 ton.

And yes, AFAIK jackstands are usually rated in pairs, except for the ones sold individually like the screw types.

For example:

 

Inquiring minds wants to know how you arrived at 6 ton jackstand as minimum requirement . You obviously know , either you calculated or you did extensive testing using multi-million dollar testing equipment , variety of jackstands and numerous superduty configurations .I also wanted to know if you used an ASTM test method or you devised your own testing .

I was also curious under what circumstances my 5700 Lbs. (empty weight on title) truck would require 6 ton ( 12,000 lbs.) reaction force on a single wheel under static loading ( resting ), or how many inches (or feet) fall is required for 6 ton reaction force under dynamic loading . Just wanted to know if you have these kind of information .

 

Dude, you can be a smart a$$ all you want. Since you don't work for me, it's no skin off my back (or my insurance) if you get yourself hurt. Knock yourself out.

 

I use a 60 ton jack for mine.

 

I'll give you the EXACT circumstance that a 6 ton jack stand is the MINIMUM REQUIRED to be under your truck... how about any time the 3 ton ones AREN'T TALL ENOUGH, which is damn near all the time for everything but changing a tire. The 23" my Larin 6 tons lift still isn't enough for me usually, the 17" the 3 ton ones go isn't even close to being helpful. If I could justify buying another pair I'd own 12 ton stands, just because they're taller. But instead of spending $125 a stand, I just made cribs for by four matched 6 ton ones I got on sale at TSC. The larger bases on the 6 ton stands are siginificantly more stable on the crib than 3 ton stands.

I use 6 ton stands under F150s frequently, not because I care about safety ratings, but again because they are 1. taller, 2. more stable on the cribs, and 3. when it comes to the Larin brand TSC sells, the saddle on the 3 tons sucks for cross members, frame rails, a-arms, or basically anything but an axle tube.

 

I use a 60-ton air over hydraulic jack with mechanical lockouts for mine. If that were to fail I'd use my buddy's 15-ton lift he has in his garage.

 

wow wow wow.... lol we have some real heated debating going on here. Im gonna have to go with all the guys that said a 3 tonner will suffice, its all ive ever used and have never once had a problem, its only a pickup truck not a locomotive, and to the guy at crushed the 3 ton, id send it back as defective lol.

and to clarify the "3 TON" Jackstand is holding the truck up, and the "Floor jack attatchment" is snugged up BUT HEY THANKS FOR THE CONCERN!!

 

Well, I'm even more concerned about safety (and Murphy's law) after last Thursday.

This here idiot had his daughter's Ranger roll off 8X8 wood ramps (bonehead move, trusted the emergency brake and wood blocks too much) and over the 6X6 blocking the front wheel.

I now have plenty of time to post now that I am back from the hospital.

I was under the truck removing the drive shaft and ended up getting crushed by it.
Fortunately neighbors came running and I was able to direct them to block the wheels, jack up the truck and pull me out before the EMTs came.

I have 12 broken ribs (front and back),9 fractured vertebrae and a punctured lung as well as misc cuts and scrapes.

What's funny is I'm the one on our race team always harping about safety. Had to miss the Primm 300 and may miss the Baja 1000.

Plan for the worst and hope for the best!!

 

WoW! Good luck with your recovery, curious to know how a 6x6 failed on a ranger, and my buddy just had a similar experience loading a pickup onto a roll back when the winch cable snapped and he didnt get out of the way in time, the truck rolled back down and pinned him under it, although he wasnt fortunate enough to have neighbors on the spot, he had a bunch of skateboarder kids sitting on the curb laughing at him ( their laughing now ...karma is a bitch lol) Now he has made almost a full recovery just waiting to get the casts off.

 

Well, the 6X6 didn't fail, I did.

At the risk of total humiliation:

Our driveway is gently sloped and I drove the rear wheels up my very stout 6X6 wooden ramps, blocking the front wheel (yes, only one) with a 4X6, putting on the parking brake and putting the transmission in park.
I then proceeded to remove the bolts (rear) on the drive shaft in preparation for a tranny swap. (Some of you may see this coming and I feel like a fool) and when I removed the last bolt (damn this ones stiff) I heard a loud pop and the truck started rolling back wards, falling off the ramp. I had completely mis-calculated the amount of holding power the transmission was carrying compared to the brake and block.
Rolling and dropping off the ramp, the truck crushed me under it, driving my right knee into my chest cavity and ultimately stopping the truck as I wedged the truck and kept it from rolling further.
Praise God, my elderly neighbor across the street (wheelchair bound) was able to shout for help and call 911.
Neighbors soon arrived (something to be said for living in a housing tract) and I was able to force myself to calmly direct them to block the rear wheels and jack up the front of the truck so they could pull me out.
My neighbor, a Chiropractor, did not want to move me but the risk/reward was better to get me out.
If a jack has slipped I'm not sure I would have survived another impact.

I share my embarrassing faux paux so that others may not repeat my mistake. As stated earlier, I am normally the one who is ultra cautious (especially with others) about safety and my default is to run through scenarios about what could possibly go wrong.
I feel stupid but I'm willing to share that so maybe someone else isn't injured or worse.

Side note: I have competed in racing (motocross, off-road both two-wheels and four) at the very highest levels both as a competitor and as a crew chief currently on a Trophy Truck team and have had my share of severe injuries. This is the first time in 40+ years I actually thought I was going to die.

Please, please, please.......step back occasionally and ask what if X.Y.Z happened. I'm not a hack or un-cautious and it happened to me.

 

Well all joking aside thankyou for putting your pride to the side and sharing that... while what happened is no laughing matter i must chuckle at the brainfart you had there, but its things like this that people share that stick in the back of your mind when working on cars and keep us from repeating others misfortunes..... from now on you should use 6-ton jackstands

 

Reps to ya croom9, well done video.

 

Thankyou !!

 

That is what you need to haul a big rear end!

A jack...

 

One of the most believable and nicest things to see on public forums is people who are big enough to come back, and tell us about their mistakes so we can learn from them --- recognizing that we all make them but many on here just don't admit it.. and don't tell when they do.

So a big thanks to you, and hope a speedy recovery for you.