I devised this simple handle setup for my box. I have decided it would be simpler to have the casters installed on the box. It will only be adding a few ounces to the weight and I fugure that is not significant enough to matter.

I asked the guy at Carr Hardware and they assured me that the casters handle weight is 125lbs per caster X 4 would be a handle weight evenly distributed of around 500lbs. Even if the details are off a bit there is no way my box would be even close to 100lbs.

The handle had to be removable as it would have been a bother to have it on all the time.

The hardware I got for each caster are 1/4x3/4 bolts, 1/4 hexnuts and washers.

The two swivel casters on the left in the pic have brake systems to keep the box mobile while I work on the airplane at the field. The two on the right are just non-swivel type cause I didn't want all four casters to swivel on me while in motion. The two non-swivel will be installed at the backside of the box opposite the handleside while the swivel casters will be closer to the handle. All casters are 2" and very well constructed but lightweight.

I will have foam lining for the gasoline can and battery to protect them from the bolts.