A few years ago, Took my son to the National Trap course with his team. HOT, HOT, HOT it was. Took some Vinyl Siding core board (3/8 Styrofoam with reflective mat on one side) and attached to the black roof on the Mule 3510 Transport to haul the kids to the shooting stations that were mile long. Temperature was 10 to 15 degrees cooler under the roof with the board strapped on the top.
It does help!