I think your estimate is pretty good. My Ranger has a 7 ft bed and extra payload package, and I can stack the logs up pretty high if I want to. But the weight is the real limitation. Having broken a rear axle before from overloading, I do stop at about 1/3 cord per load. BTW, I'm 6'5" and fit in the regular cab fine with the seat back all the way. Boy I can relate to that... I'm keeping an eye out for a basic trailer. If I could get another 1/4 cord per trip that would be very worthwhile.