Not so much TCDS, as most any glider will have those. It defines how they can get their airworthy cert in the US. Either Experimental or standard.
Most "renters insurance " for airplanes, will not cover experimental aircraft. So you want to make sure that the renters insurance will cover what you want to fly.

Dealing with gliders, it may be best to deal with a broker that is experienced with gliders, standard and experimental certified.

BillT