A few years ago I took my grandson (then 13) into Washington's Alpine Lakes Wilderness, on a trail that supposedly was completely rebuilt a year or two before.
It turned out that the trail consisted of gigantic steps 2-3 feet high. Being short-legged and with a bum knee, I had an awful time, especially going back down--I basically had to sit down and slide my rear off many of those steps. I came out at the trailhead with my hiking pants split from stem to stern down the seat. (Fortunately, I had a change of clothes in my car.)
Even if this trolley pack were allowed (it isn't), it would be impossible to drag it up and down that "newly improved" trail!
May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey