Minimum Machine Sizes For Final Mile Delivery Machines:
Skid Steer Specs
Use a rubber tracked skid steer for paved roads
TRACTION FORCE & TIPPING LOAD are the most importance specs.

Minimium Excvator
Minimum machine weight: 22,000lb (full size)
Mini-Excavators WILL NOT move the carriers & boxes
CRANE
Able to handle a grade change of ~2'...they can adjust their suspension to crib