I have seen the deer you shot in the past and they all looked very capable of being dragged............I doubt 215lbs is an average weight for the deer you shoot.
Average is about 200 for bucks, 130 for doe's
I have dragged plenty of little ones out for my Grampa, no problem.
Heaviest deer was 247 lbs dressed, that was tough drag. 500 yds through the corn field.