Went to lake and found 20 plus kayaks in cove we planned to launch in. My wife and I were screwing around rolling and self rescue playing. Many of these boats were entry level boats with beginner skills paddlers. We were talking with people and were showing some interested paddlers some self and assisted rescues.
I did a wet exit, emptied to boat before rolling it over and got back into the boat, no big deal. A very athletic 20 something struggled to empty his boat and roll it over, I tried to show him, but there remained at least 4 inches of water in the boat after flipping. We went into shallow water and attempted to lift from front and rear ends (no front bulkhead) and the water would not fully drain and left at least 4 inches in the boat.
I had my Valley Avocet, WS Zephyr, and Necky Manatou, The Avocet and Zephyr had less than a half inch after lifting and flipping, the Manatou had about an inch of water. A WS Pungo had about 3 inches of water. The boats with only 1 or no bulkheads had at least 4 inches of water on board after flipping, one boat (Waterquest) actually sank just under water level with its foam flotation blocks being little to no help with buoyancy.
So from here on I will consider any boat that cannot be drained (without the aid of a pump) a rec boat.
In the spirit of testing, also present on the medium textured dry sandy beach (think sand box sand) were pneumatic tire and wide plastic tire C-Tugs, with similar loads both sucked about equally, the pneumatic tire carrier sank into the sand, the wide plastic wheel piled up sand in front of the wheels making both about equally hard to pull.
Fun day had by all.