My favorite body clippers are the big Oster single speed ones. I have those, the Oster variable speed big clippers, and the Andis you mention above. I have body clipped with the T-84 blade without a problem on a horse that was too sensitive to the noise of the big cippers. But the big clippers do the best job with the least problems.
i love my andis clippers, but the most I've asked them to do was a bib clip - which went fine, but I can't imagine using them on a hair beast for a full body clip. I have a set of big osters for body clipping and my andis are for touch ups and trimming My Andis clippers are about 7 years old, the Osters are probably 5+, I got them used.