I think using dynamite would be safer than a hi lift for any of those...
whilst dynamite is a ridiculous statement, the use of a hi-lift to raise a vehicle and remove and replace a tyre is not and is no less safe than the original jack when done with appropriate precaution and tools. Any other work done under vehicle is performed with chassis stands in place so again, no issue. Next time you pull out the original jack, have a look at where and how it locates in its lifting position....it isn't a very big top on the jack, it has a small indent to sort of conform to the rear axle housing but as the vehicle lifts the contact point moves in an arc and so does the contact point. This has slipped in the past for me so I'm not keen to use it again.
At the front of a 100 series cruiser (IFS) the factory lifting point is on the front crossmember. With a nominal 50mm suspension lift and 285 tyres the standard jack won't lift the tyres off the ground anymore. Solution, hi-lift into located slots in bulbar....simples and perfectly safe to work under if you have the means to provide secondary support.
Sent from my iPad using Tapatalk