I've lifted from the hitch with a high lift before, the thing you gotta watch when doin that thou is high lift jacks are VERY easy to tip over, even if you have a big beefy bumper and a nice secure jacking point you must be very careful with that jack! Contained in a hitch receiver the high lift will still easily fall over if you lift both wheels off the ground as the base's are hardly big enough/secure enough to support any side to side load. Also, I've tried lifting my 3/4 and even my 1/2 tons pickup's front wheels off the ground via my bolt on winch bumper and found the weight of the vehicle causes quite a bit of twisting in the frame and bumper mounts so I dont really recommend the high lift for changing flats due mostly for the flexy nature of a 4x4 and the hight you would need to lift the vehicle in order to get the wheel off the ground. I think of a high lift as more of a multitool of four wheeling. If you do need to change a wheel your best bet would be to A: get one of those wheel lifters, lift up flat tire and block axle with wood/jackstand/small abandoned civic or B: carefully lift from one corner at a time with tranny in gear/parking brake applies/wheels chocked. Remember! Safety first!
When using the jack considerable force is present in the jack handle and can do alot of damage to a chin or w/e in the way of the flying handle if your not careful. Also, one time I let go of the jack handle while lowering a vehicle and the jack handle falling carried enough force to release the pin on the high lift allowing it to go down another notch, causing the handle to fly up very powerfully. Then the handle fell down and repeated the motion until the vehicle was on the ground O.O The sploder I was lifting wasent very far from the ground when this happened and there wasent much load on the jack so such an occurance may not usually happen but it's a good idea to make sure your jack handle is secure when working around the jack in a loaded position
On a brighter side, a high lift is an indispensable tool for 4x4'in as you may very well know. I've used it multiple times for getting myself out of high center situations and with the proper accesories it can be used as a makeshift winch/tire lifter. Good for getting tree's under the tires, chassis off of tree stumps and they are just damn cool!
Edit-I'm sure theres more high lift guru's with a hell of a lot more experiance with them than I with some nifty tips for lifting safely, I just dont like seeing a high lift mostly maxxed out with some mean angle holding my rig up while I try to do work around a wheel....damn thing could remove far too many teeth and brain cells
Edit2- Oh yeah XD I've jacked from my sploders front bumper before where the bumper meets the frame rail, It didnt really mess up the bumper but theres nothing really substantial keeping the jack from going out sideways....and I DID put a dent in my hood once when the truck slid back a bit, I was trying to get out of a mucky stuck and it slid back as I jacked slamming the end of the I beam laddar frame thingy into my hood, pissed me off at first but it was the first of many proud dents to come
