The Rescue Truck is a Mercedes-Benz Unimog truck utilized by the Gatherers on Isla Sorna. The vehicle was included as part of the Tracker/Trapper series of Matchbox's The Lost World: Jurassic Park Action System toy line. It was designated as Vehicle No. 10 fitted with a large plow blade and open-topped container in the truck bed which featured a hinged tailgate and a winch.
The Mercedes-Benz Unimog was an older casting at the time of its use in the Lost World line, having been introduced in 1983. It doesn't represent a specific vehicle from the film as the Gatherers didn't use Unimogs, only the InGen Hunters did, but it features some visual elements from both InGen Unimogs that do appear. The body length and cab recall the U 1300, while the container is reminiscent of the U 2450 L/38.
In early promotional material, it was called Mercedes Unimog, but upon release its name was changed to simply "Rescue Truck" for some reason.