for other ideas, also check out Pirate 4x4
A cool 4 wheeler trick I recently learned about, likely the basis for using an automotive spindle and bearing assembly as the pivot for a home fabricated swing away is two-fold:
1) Incorporating a new or used front hub assembly (one that fits YOUR vehicle) allows you to scavenge desperately needed parts from your tire/box carrier, should you have an issue with the front hub while out on the trail. Having tools with you is great, but without spare parts, often you're hosed.
2) serious off roaders always have tons of spare parts laying around the house, using a removable 4x4 spindle and bearing assy is often no cost, and way overkill in terms of strength.
1995 E350 7.3 Diesel, 4x4 high roof camper, UJOR 4" lift