Yep, buy what you need for the vehicle or the specific jobs you will be doing.
I work on tiny compacts (Fiesta), small SUV's (Escape), mid size (Taurus) and a Ford Excursion that weighs 7900lbs empty, and a 34" travel trailer.
I have 4 of each size 3 Ton, 6 ton, and 12 ton. The 12 ton is...