Marking machine with external drive carriage

The easiest way to turn a towed machine into a road marking machine with drive is to use a drive trolley. This is coupled to the marking machine by means of a trailer coupling. The mode of operation of most drive trolleys is identical. Two pedals on the feet are used to drive forwards or backwards. Try out these trolleys on inclines. Does it start smoothly? Is it strong enough to meet your requirements? How can it be parked? How safe is the device? Is there a working light? Brakes, etc.