5er wonk
Are there any engine issues I should be concerned about with it laying on its side?
Not unless the engine was running when laying on side
What about possible rear end damge when the right rear wheel got smashed?
Any way you could have a shop inspect rear end housing to see if it has been bent?
If there is no visable signs of damage ,then just drive it,,If a bearing has been cracked or if the axel is bent some ,I think you would know soon..
Would you bite the bullet and trade it for a '07?
Considering that you have already taken a hit on depreciation and would take more on a trade ,I think I might wait and see how present truck works out.. That would give the new 6.7 and the 6 sp auto trans time to prove themselves.
And whew , thats a lot of body damage,,Good luck..