I have a similar tool. Rather than a handle and brace, it has two handles. I bought it after injuring myself while using 4-foot breaker bar to loosen some lug nuts. I have tried it on my lug nuts, but they are best done with a big air wrench. I probably can't lift the tire and wheel anyway.
The tool really worked well on my under the coach suspension repairs. There was no way to orient a long breaker bar, and a two-foot was no help. The torque multiplier tool made loosening the big nuts an easy job.
http://www.amazon.com/Torque-Multiplier-Power-Wrench-Heavy/dp/B017WMAKSA/ref=sr_1_12?ie=UTF8&qid=1458155113&sr=8-12&keywords=torque+multiplier
If you use a large breaker bar, be aware of what will happen if the bar snaps or slips.
oldMattB
1998 Monaco Windsor