Profile: Simonsen Mfg. Co. manufactures LP gas delivery trucks. Our products include pull spreaders, chassis mount spreaders, tenders and LP gas trucks. Our spreaders designed for rugged use and easy maintenance. Our chassis mount spreaders model is designed for extreme duty use and is welded inside & outside for trouble free operation & easy maintenance. Our fertilizer tenders will get the fertilizer from the plant to the field and into the spreader quickly and efficiently.