15"!? Wow! And where do you store all that stuff??
Except for the lego blocks, all the wood is stored in a single box that is 16"L x 13"w x 11" tall. The box easily sits behind the driver's seat in the back seat on the fold flat floor of the Ram. The lego blocks fit under the box below the fold flat floor.
Also in the back seat are two chairs, gas grill, case or two of water, quick fold table, table cloth, and water hose. If we want or need to carry other people, it can all be easily moved to the camper, but does make it harder to get around.