I can't remember, but I believe the A-T-S bike had the longer/more consistant history. I recall it being rebuilt once, might have been a crash. The gray matter ain't what it once was. Several folks were trying 2>3 engined Harleys at the time also.:action:
T C Christiansen and his Hogslayer was ... and is .... awesome. I remember the first twin engined Hogslayer well, it was indeed a "Hogslaying Show". The triple engined Hogslayer was later. His secret at the time, or rather his deal was instead of wild wheel spin in one gear, he had a two speed trans and his own slipper multi plate clutch and ran a much wider tire that hooked. In the early-mid'70s when I started riding .... first onmy '70 Norton 750 Commando and later, my '74 Trident .... TC Ruled.