An easy way to increase basement storage is to purchase some 2' x 4' pieces of plywood (or cut up a 4' x 8' piece of plywood into four pieces).  These 2' x 4' sections fit nicely onto the top lips surrounding the three large storage bays on my 98 36T.  However, the plywood for the bay in front of the rear wheels has to be notched for the power receptacle.