RE: rear tires inside wear?
Sounds like the tires may have been on the front and that's where the uneven wear occurred. If that is not the case, best to take it to an alignment shop to see what is going on.
An accident, as mentioned previously, may have bent the axle and would likely require an axle replacement. Any damage to the axle should be quite visible if bad enough to cause tire wear as you have described.
2002 Dodge Grand Caravan Sport
2007 Dodge Grand Caravan SXT
2003 Jeep TJ (Wrangler)