I'm not sure how your chickens have been using the ramp, but mine would be walking part way up and flying out of the tractor.
I vote that this is an OK cheap spring - fall breeding tractor. But any heavy rains or snows could just demolish the little house part and maybe the ramp.
Since your first winter is coming up soon, here is some advice you might be able to use.
Moving a tractor in winter is hard work. We pick a place, put down some wood chips and that becomes the winter chicken area. Next plan on having an enclosed space for your chickens to spend 3-8 days at at time in plus their outside run. So a tractor that has only a small sleeping quarters is not great for winter. We move our small summer coops into our pole barn for winter, otherwise we would need to plywood all 4 sides for winter and remove all 4 sides for summer. Next water freezes ever so fast you may want to pick a spot near electricity so you can have a heated dog bowl for winter water.