Abstract: A passive insulating tank support structure includes a first interface ring mounted to a first tank, a first support ring surrounding and spaced apart from the first interface ring, a second interface ring mounted to a second tank, a plurality of first struts coupling the first and second interface rings, a plurality of second struts coupling the first support ring and second interface ring, a plurality of third struts coupling the first support ring and a first heat source, a third interface ring mounted to the second tank, and a plurality of fourth struts coupling the third interface ring and a second heat source.

Abstract: The invention provides an extendable utility device including: a central housing; one or more extendable members attached to the central housing; one or more spirit vials (i.e., a level) embedded in the central housing; and one or more wall markers attached to the extendable members. The extendable members extend from and retract into the central housing, and the wall markers are individually positioned perpendicular to, and at the ends of each of the extendable members.