The place the bolts are mounted make a big difference. You want the bolts to be mounted as close to the outside edge of the fuselage as possible. If you mount them to far inboard, there is a lot of tensile stress put on the bolt heads (the gear flexes and bow outward on the inside of the mounting holes) and will pop off the bolt heads rather than shear sideways. Typically a 1/4X20 nylon bolt has a single line shear strength of 200 pounds and a tensile strength of 150 pounds.