Nonetheless, it's cool today as evidence of the first wave Star Wars craze of '77. You are looking at one of the Star Wars SSP (Super Sonic Power) toy vans.
Two such vans were released, Luke's (which is white), and Darth Vader's, which is black. Both vans had a fifth wheel located under the center of the van, and the vehicles could be raced by a kind of primitive launching instrument/mechanism.
Can't you just imagine cruising down the streets of Southern California in one of these for real, your hi-fi tape deck blasting Melanie's "Brand New Key" while you "feel the force?"