Looked at the Cargo Maxx.
Nice workmanship. The body is very aerodynamic.
But I stayed with Aerocell for two important reasons.
Look at the GVWR for the Cargo Maxx:
GVWR Options
Single Rear Wheel 10,750 lbs (80" width)
Dual Rear Wheel 12,300 lbs
Dual Rear Wheel 14,200 lbs...