If it was the axle bearing...you'd know from all the noise/vibration or the seal letting go and you gitting gear oil all over the brakes...
If the axle was bent, you should be able to jack the rear and spin the rear tires. If it was that extreme, you'd be able to see the tire wobble...and you'd git some terrible tire wear back there.
If it was the wheel lugs, I don't think you'd be able to put the drums/wheels on straight without some pounding...that or they would've broken off by now. If you are that concerned about them, pull and replace all 12 of them...maybe $20 in parts from AutoZone?
Got piccies of the drums that are gitting egg-shaped? What brands have you used? Are you sure yer putting the shoes on correctly? What components have you replaced/repaired? What precluded the drums being replaced? Were the old ones doing the same thing? Are you applying the parking brakes when the drums are hot? Maybe yer LSPV isn't working correctly?
From a website...
Quote:
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Out-of-round or an egg-shaped drum can result from applying the parking brake when the drum is hot. The locked position of the shoes prevents the drum from contracting normally as it cools resulting in permanent distortion. This can cause a pedal pulsation when the brakes are applied. Drum runout should not exceed .005 in. If the run-out cannot be removed by resurfacing, replace the drum.
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