Having purchased the K-Line Lima Berk (for $400; probably way too much for what it is), and having a beautiful line drawing of same from David Weitzman, I am aware of the tender and trailing truck discrepancies.
I see these complaints, and have no sympathy. Throwing rocks at a supplier is not the right approach - not purchasing the incorrect item would be a better way of going at it. A purchase means you are at least somewhat satisfied with the bargain.
I have every intention of correcting the flaws on my Lima some day, but its small size relative to everything else in my collection gives me pause. I am actually tempted to sell it and start from scratch in a scale more in consonance with my track.
I will not blame K-Line. It was my decision to purchase the thing, and to keep it when I discovered that hideous boiler belly. K- Line, and now Lionel and MTH, are making great strides toward truly realistic models. I am willing to bet that, now that such truly accurate models are coming for the 3-rail crowd, it will not be long before the track starts bothering folks a lot more than the curved top of a tender.