On a personal level, I won't use a nylon bolt in any location that's a high stress or load area. That includes landing gear. Matter of fact, I'll use a nylock nut, but won't use a nylon bolt at all. On anything that I value.

A long, long, time ago, in a place far, far away, back when I was taking landing gear off all the time, I tried using nylon bolts thinking that the break away stuff would save the bottom of my planes for me. Bunk. I actually lost the gear more often. The reason you ask? Because as soon as you tighten a nylon bolt to a point that will secure something, it has been stretched to the point that it will easily snap with any shock loads. The darn things are designed to break, right?

Another reason is because I lost an old "Das Bipe Stick" in flight on which the bottom wing had been secured with nylon bolts. You are already visualizing the scene, I think. The bolts sheared in a tumble (it was a GREAT flying plane), the bottom wing separated, and the rest is history after the battery exited the plane.

It's one thing to risk the bottom of your plane when the gear gets torn off due to a tear in the nylons. It's another altogether to risk the life of the aircraft and people around you.

Your plane, therefore your choice, but I would think very carefully about this one. It also becomes your loss, and perhaps, your liability[X(]