Global Transportation & Logistics Mobile System for Transportation Service Providers Software is designed for United Software existing customers to manage and view data from the in-house HHG Moving & Storage Software via a mobile device. GTL Application is the leading software for Moving & Storage Companies, Agents of Van Lines, Carriers, SCAC Owner, Logistics Companies & TSP'S. GTL Systems supports all published tariffs like 400NG, GSA01, I-15, TOPS, Local, Intrastate, Van Lines Tariffs.