No room for granular fert? Its all in knowing how. You do what you have to. Its tight, but...I can get about 10 bags plus a spreader on my truck. (Keeping the tank almost empty because of the weight.) If I need to I can get about 10 more bags in the cab. (Handy if rain). If I leave the spreader home the guys at my fert dealer can get 32 bags on board--but only for the short trip back to the warehouse. Tight fit. LOL!