The OEM jack has worked just fine for me. I've used it numerous times to jack up my truck with the camper on it. (Just over 6000# on the rear axle).
Shouldn't make any difference how much lift your truck has as the jack is designed to go under the axles. Of course if you have oversize tires, that's another story, but a couple of 2x6 blocks should work.
A 3 1/2 ton floor jack is my first choice when at home, but the OEM jack is of decent quality especially considering that it's intended for occasional use!
Page 110 in your 1995 Truck User's Manual describes the various parts of the 'emergency jack'.