What equipment do you use to load and unload them?
Typically whatever equipment is on hand. Skid loader, regular loader, excavator, tractor with forks, telehandler etc. Smaller equipment handles the smaller logs just fine, but the big suckers like in the above photos require a loader or excavator to lift and stack.
If im next to the road or on good hard pack then ill load high and heavy, but if im half a mile back in the fields I keep it lighter and lower. Body roll over rough ground with a tall heavy load gets the adrenaline pumping a bit high for my liking.