Why jacking ponts on bars are a poor substitute

Davoe,
The HLJ (high lift jack) has many uses. The 2 set-ups you have described would not normally be used to achieve the same result, nor would they be used in the same circumstances.
Attaching the hlj to the hub is the "right" thing to do when you need to lift that wheel to pack stuff under it (say in the case of when you're stuck in deep wheel ruts and have bellied out).
Using the hlj under say the middle of the bullbar or rear bar is not as desirable but can be used (under strict supervision and in the knowledge that damage to the vehicle may occur) to raise a vehicle clear of an obstruction and then pushing it to one side; off the jack. Doing this can move that end of the vehicle up to 1 or 2 feet across at a time. Whilst I haven't seen it done, there are stories about blokes turning a vehicle a full 180 degrees in it's own body length when there has been no alternative.
As for the 30cm v 17cm between the 80 and 75 series, that is to be expected due to the relative lack of articulation offered by leaf sprung vehicles when compared to coil sprung units.
Cya mate

Thats why i carry a hydraulic bottle jack , steel base plate . I do have a hilift jack in the back for emergency purposes (swapping for cartons of beer if i run out in the sticks) .

both have their uses, i carry both types everywhere, ive even heard of a high lift being used as a bead breaker,

and a bottle jack is an amazing invention too :o)

Lazy