Heaviest head was probably a Rivera Bonehead. Massive...The full width of a 4x12 cab, plus pretty tall and deep. Speaker cab...I had that 4x12 recto cab clad with the diamond plate armor. That had some heft to it. My first “nice” amp was a 60’s Gibson GA55-RVT, aka “Ranger”. It was a 4x10 amp...but stouter and heavier than the super reverb my bandmate was using. Don’t recall the weight. I was a teenager with an indestructible back. But it was heavy. I’ve had plenty of boogie combos with EV’s, and they are very heavy for a 1x12, easily over 80lbs. Had a buddy with a MESA Road King combo. 98 lbs per Mesa but it felt like more LOL.