I delved into unit bearing replacement on my 2001 Dana 60 front axle a couple years ago, one of mine started grumbling and screeching during a 1500 mile trip, luckily at the tail end, about 20miles from home. Being a non-servicable part, there's no roadside fixes, or scrounging
Having a spare on hand, particularly when these are a specialty 'modified for Quigley' deal, seems like a 'must' for anyone with that set up. Either that, or carry a wheel adapter in your spares box, so you can locate a common Ford unit bearing assembly, and adapt the stock 8 on 170mm to 8 on 6.5" van wheel, to get you home.
1995 E350 7.3 Diesel, 4x4 high roof camper, UJOR 4" lift