JBL SRX910LA-VT Vertical Transporter For SRX910LAAudio professionals looking for an easy way to protect and transport up to four SRX910LA line array elements will need the JBL Vertical Transporter. The truck pack friendly transport cart features a base unit with four heavy duty casters and a hard top (VT TOP) attachment that connects to the top cabinet of a stack to create a robust and defined footprint for stabilization during transport. Additionally, the VT TOP allows other gear to be stacked on