u got drums or discs on the rear

perhaps its not adjusted properly?

On mine (Rear Drums) I can lock them soild at will. Especially on gravel or snow.

 

Drum. on gravel,snow any surface like that they will lock, most of the time. But living on a steep hill ill have it fully pulled up and ill still roll, enugh that i rely on the transmission to keep it stationary.. they dont lock at speed going forward either

 

To me, that sounds more like something is wrong with them vs. not being strong enough.

 

there is NO possible way you'd be on a 50° slope!!! the steepest road in San Fransisco is 31.5% grade. a 12/12 pitch roof is 45° Daytona speedway is 31° bristol is 36°. motorcycle hill climbs are 50-55°

drum brakes are most effective forward and not in reverse. this is due to the self-energizing design in drum brake systems.

if you need more holding capacity, install a hydro lock brake system. you apply the brakes, pull a lever and the hydraulic pressure remains applied to all 4 brakes.

 

SO maybe i dont know my exact slope degree of my driveway..

 

regardless of the slope of your driveway, Properly adjusted/functioning Ebrake will lock those wheels up solid.

Better pull those drums off and inspect
set the handle up so they are fully locked on at 3 clicks.