If I can use a motorized vehicle, I have an extended cargo van that has a 3800 lb. cargo capacity. If could acquire one some how, I would go for a big dump truck with a snow plow for pushing my way through barriers.
Loaded with all the guns, ammo, food, clothes, and tools it will carry. I have one piece of 1/2 steel plate I came by for armor. I should probably buy more just in case but they weigh about 300 lbs each. So I would lose 900 pounds of other cargo.