Time to re-post this to show the safety wire
loosely tying the spokes together at the crossing points. It would have been better if done at the cross closer to the hub, as the idea is not to put a load on them, just to keep them from flailing if the nipple comes off. Using small ty-wraps works fine for this, too.
fwiw - Old pic from my 1st Tenere tied down in 6'3" bed of a Nissan Frontier. Grooves in brake rotor are visible. The red is just pinstripe tape from a car parts store and after a couple of weeks it was pretty impervious to rocks.