I wasn't watching RPM's I was just simply watch how flat the line was left to right.
With gear ratios like 5.13, 5.38, 6.17, and so fourth a top end puller would work great for road speed on the highway
I got a GMC V6, 4spd, and 5.13s or 5.38s even with 19.5s its only does 58-62.5mph at 3,000rpms.
245/70R19.5's = 58mph@3K-Rpm and 8-19.5s = 62.5mph@3K-Rpms
GPS'd it even.
Its a mean truck off the line but once it rolling in 4th gear its all done, It'll tow a lot behind it though and have no issues.
Drop 18-22K-Lbs on the hitch and roll it down the road.
Mike