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Champ,
It took me about 6 months to finally install the rear after installing the front. So I had a lot of experience with only half of them being on. I never used the roto wheel chocks for reducing movement, fyi, at the same time. I would say that just the front probably dealt with 75% of the movement. The last 20% came when I put the final rear ones on. I think part of it is that you LIVE in the rear side, so you're walking and moving a lot more on this. When you were in the bedroom it would seem like it would hardly ever move.
Note: The above is 95%. Still 5% movement (liveable, mind you - it is and will always be on wheels).
So to answer your question, the rear ones did provide something, but the front four were very beneficial on their own as you suspected.
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