Adjustable height hitches are practical for most tow vehicles to get a safe and level load.

The ADR 62 and Australian Standard 4177 also dictate legal ball heights for towing (basically a 50mm ball has to be no more than 400mm from the road surface).

Even the factory Towbar that was supplied with my Suzuki Jimny mounted the ball at 395mm (which was barely legal).

(Articulated Hitches like pin hitches or block hitches don’t have this restriction. I use a ball for my little garden trailer and a DO35 for my lightweight off-road camper. I have different height drop-hitches for each type of trailer.)