The secret to cargo cycling is patients and low gears.
I know of one man that built a long cargo bike with the cargo box to the rear rather than in front of the rider, he has a hard time balancing it on the turns.


I need 10 gear-inches with 390lbs on 16% grade. That’s about 2 mph with a 60 rpm crank spped.
However it is possible to climb hills in higher gear on an MTB I use 22 gear-inches as apposed to 18gi on my recumbent bike.

this is what I do with my legs:
18 front / 34 rear sprockets = 1 to .53 ratio .............
60 rpm’s at the crank x (.53) = 31.76wheel rpm's..............
62.8” circumference x 31.76 rpm's = 1994.82 ipm ..............
Divided by 12 = 166.235 fpm ..........
166.235 x 60 minutes = 9974.117 fph ............
Divided by 5280 = 1.889 mph.........

has any one else done this kind of hill climbing?