You're 39yo now? That's what age I was when I had a low speed crash with a quad & cracked my pelvis... 8wks before I could walk again & over a yr before I could lift & carry more than 20lbs. The lower back pain I suffer from the last 3yrs, the majority pain is right where the crack happened, 2" left of center.
Since 30yo with my 1st quad, I use to ride over 5000miles per yr, drove it everywhere 12months of the yr, it was an awesome tool for the farm, especially with cattle.
I still use a quad on the farm, but I travel a lot slower. the wheels never leave the ground & it's strictly farm use for crop checking & fencing. I can't afford to get hurt nowadays, if I get any more physically handicapped than I already am, my farming career will be over!
Don't mean to rain on your enjoyment Reg, but we aint 20yo & heal fast anymore... I absolutely love the use of my new workshop this winter, but I can't put in the big hrs you do everyday b/c my back pain won't let me... just saying, be careful.