Important testing! For science of course right?

Doing a little acceleration test with Betty and Big Blue. The big 460ci v8 isn't in perfect health and neither is the transmission. I don't know the weight of the big 4 horse trailer but I'd guess 5,000lb or so. I need to get it weighed. I was really impressed with how well the truck pulled in this clip. The next day I pulled 3 horses in the trailer with no issues.