We used to use them a lot . Is it the petrol driven rubber tracked type ? If you are using it for concrete etc tilt the load forward so its level with the slope and doesn't slop out when going up hill . They go uphill well . Be careful Iv'e seen a few accidents with them . Try looking on utube for "petrol tracked wheelbarrow " or similar.

(quote author=657A786A4747130 link=1366882068/0#0 date=1366882068]can anyone who owns or has used a motorized wheelbarrow tell me if it is any good to go uphill (25% to 35% slope) on a narrow rocky path?
we want to buy one, but we are not sure about it being able to do the job.
thanks!!!! [/quote]

The ones we used were bigger and more solid looking with rubber tank type tracks . Made by Honda I think.

You could use a Muck Truck,with Honda engine,4 wheel drive,used are 400 to £500 on ebay.
The type with the pressed tin tub will spill contents going up incline !