Hello Ron,
We had Phoenix hinge both rear bed platforms. The storage under the passenger side is GREAT. It's carpeted inside and runs the whole length of the bed, it can easily hold two pairs of snow ski's and a few other items. The storage from the outside is excellent, it also goes the entire length of the bed.
The drivers side houses the water tank so the storage space is limited. I like being able to store smaller items in there. I installed a water tank similar to yours in that area, having access also allows us to check the pressure on the water tank.
The bed on the drivers side is approximately four inches wider than the bed on the passenger side.
I agree that it's nice not having the extra weight of the rear slide.
We have owned three Born Free's and two Winnebago class C motorhomes over the years I'm pleased to say the Phoenix 2910 single slide with the rear twin beds is our favorite, we really like the quality and the floor plan.
We took delivery in March of this year and are currently very close to 15,000 miles. Lord willing we plan to leave tomorrow morning in our Cruiser to spend Christmas with our family in Florida.
Merry Christmas,
Dave