I have one too. the controllers are infamous for going bad. Your vehicle seems to be in great shape! These things are kinda rare. They were made by Dumar, but megatredz has taken over. They have a few parts for it.
I just picked up one of these.....faded and missing the back axle and wheels. It appears to be Peg Perego brand......it has an unaltered Peg battery connector, and from what I could see it has the gator style dump bed set-up.
saw it on craigslist, had never seen one before....had to drive 1.5 hours to get it.....she said it just quit working......it is faded, missing the rear axle/wheels and one mirror.....but it sure looks like a neat machine.....I'll take some pics tomorrow