We first thought it was the brakes, we took the planetaries off to see, but couldn't get to them from there. The way it looks now, we will need to take the mast off to be able to get to the brakes. We don't have the service manual, but does the mast need to be removed to access the brakes?

Everything is made more difficult since it's still on a trailer. Our plan was to charge it (and it took a charge fine) then drive it off, but it won't drive forward.