I have the cub spacematic drover and they are a big unit once opened up. I've had mine now for about 6-7 years and love it. Very capable with full independent suspension.
Re the zip, I recently was away and the zipper wouldn't close for the life in me from the first moment. On the curve it kept on separating. We were lucky as we were in a caravan park and we had to put up the walls on the annex to stop the draught coming through the camper.
I went off to officeworks in town and got some bulldog clips to keep the door panels closed for a couple of days and was trying to figure out how I could get it repaired without removing the whole tent. Found a local canvas repair guy who I went and spoke to. He asked me a few questions re missing or broken teeth on the zip, how old etc, and then told me that it was more than likely the slider was worn.
He gave me a suitable slider, told me it pick the zip apart at the tail end, remove the old slider and try the new one. Took about 15 min to do and it now work like new. Total cost was $5.
Well worth the try before removing the whole thing.
Also fridge removal is a few screws and a gas line. Easy as. You have full access to the fridge with the camper closed and heaps of space for thing to be stored at the foot of the bed. I would say an area of 3 feet 3 feet approx.
Under the bed We keep chairs, tables, annex and walls, cooking bits and pieces, etc basically things we don't need till we are setting up camp.
Hope that helps.