As mentioned in prior post a High Lift jack can be dangerous even if used as it is intended.
I think most all rigs can use a high lift if they are set up for it and used in a safe manner, my suggestion would be to find a level spot and try to simply jack up each corner of your rig in a safe place where you can see just how the thing works.
A few things we did back in my winch challenge days was to take short heavy duty straps to choke up the axle to the frame, We used a large ratchet strap to stop axle droop while jacking. This method keeps the vehical stable while jacking because you are only lifting the chassis a small amount to get wheel and tire up high enough to change tire.
Another problem is lack of maintance on the jacks, they stick and hang up if not properly taken care of and get people into trouble when the pins stick and don't move when there supposed to.
As far as cable or rope goes, Cable is as dependable if not more than synthetic rope and cable requires less maintance than rope does and will outlast it if used correctly. Both wire and rope after each use should be un spooled and respooled to verify it is on the drum nice and this is also when you check the condition of your wire or rope.
Cable can be dangerous but if cable dampers are used which should be used on rope as well it will help absorb the energy of the break, most close calls you here about with cable or chain breakage is due to a situation that shouldn't have been. Why was someone in a place where the cable or chain if broke could have hit them, I always say the one operating the winch is responsible for the dumb people in the wrong spot! its up to the operator of any recovery device to police the situation and sure its safe to start the recovery.
So all in all the high lift is a good item to use as a winch and is only as dangerous as the operator "IT CAN BE A TOOL, OR A WEAPON IN THE WRONG HANDS"
If you are going to use the jack as a winch you will need twice the rigging to be safe! you in many cases will need a second rigging to hold the vehical from slipping back into the hole or ditch while you get another 48" or 60" bite on the rigging. Again find a spot you can practice with a scenario and you will have a good idea what your up against in the field.
I make my 16 year old son practice winching and useing his high lift in the drive from time to time to make sure he understands what he has with him when hes alone in the bush.
ok enough of me rambling about this stuff
Cheers Ed