A 1977 Chevrolet C-10 pickup with a trailer made from a matching truck bed
...and with 4-wheel-drive and what looks like a 30-speaker sound system!
This customized ride is one of several vehicles used to promote a company or store specializing in installing such systems in cars and trucks...most likely to transform them into "party machines". Not only did these systems have large speakers and amplifiers, but also color-changing LEDs and big flat-screen TVs for showing music videos and other programs.

2021 Houston Auto Show