To quote Mouse, yes there is MUCH more space without them. We are missing one front and one rear, and I removed the one under the sink, and also removed the water tank. I lined the spaces with carpet pad to protect the outer shell
fiberglass, but not as a permanent installation, just laid it in there. Found that my marker
lights were leaking water into those spaces. Thomas modified a storage unit for under his sink which gives much more space than the original liners. You'll find lots of ideas and info here. Bob