compact, often weigh around 4kg for a 4t, but many 4WDers prefer an 8t rated version which also goes higher
safest for changing tyres
requires a base plate
will not work well on sand even if you do shovel sand away
will work in some mud but not if bogged down in mud
not the best for salt lakes or swamps
best jack for hard ground and rocky ground as not only is it the most stable but you can drive off with it jacked up and the jack will just roll over
can also be used to bend metal or pry things apart
dirt, mud or sand does not effect them as it does a high lift jack
you will need to get under the vehicle to place it
need to have two different sizes for when you can't get the larger size under, you can start with the smaller one (but the smaller one may not get enough height by itself)