2Pcs Packaout Wheels Compatible with Mil. Waukee Rolling Tool Box 48-22-8426, 9 Inch Packout Replacement Wheel Kit, Alloy Wheels Strong and Not Easy to Crack, Can Roll Smoothly on Various Terrains

100% first upgrade… put on rubber wheels, makes pulling it over gravel etc a dream. Game changer. 2Pcs Packaout Wheels Compatible... https://www.amazon.com/dp/B0DGL86WVN?ref=ppx_pop_mob_ap_share I’ve used one for a year and it holds everything I need