Something else to look at too is what is the "reach" of your jack?  A
lot of your "inexpensive" (even Craftsman) jacks have a reach on them
that may not be enough for your truck.  You may think about getting
one for trucks and suv's as they lift higher.

Your registration isn't going to tell you how much the truck wieghs. I have
a 2500 quad cab 4X4 with the (heavy) diesel engine and it weighs less than
7,000 lbs empty. Maybe your jack is reaching the end of it's range of
travel. The 2 ton capacity should be plenty to lift a wheel off the ground.
Will a 2 ton jack safely hold the load? No. The jack is for lifting, not
holding. Get jack-stands to hold the load. I refuse to go under any vehicle
that's held up by a hydraulic jack.

I have a quad cab 1500 Ram.  The registration says it's 7000 lbs.  I have a
2 ton jack.  I jacked the truck up at the front right wheel, which was flat.
It took all of my strength to pump up the last few pumps.  I was afraid it
would fail, and it was creaking a lot.  Will a 2 ton jack hold safely this
load?  Theoretically, it should hold at least 1/2 the truck's weight.  But,
as hard as the last 4 or 5 pumps were, I was concerned the jack would fail.
Any opinions?

thanks
Brian