Not to detract from the topic, but SketchUp doesn't produce flipped or double faces, the aritst does, same as a messy modeler would in Max, Maya, etc. If you know what you are doing, SketchUp models can be very clean. Actually, flipped normals are a lot easier to see and clean than in Max, but once you understand the basics, you should never have or create any flipped normals. Double faces are pretty much impossible to create since things autoweld, unless the models you encountered had groups that overlapped and were exploded as it was imported into Max.
Not trying to start anything or call you out, just letting you know that SketchUp is a different animal. I think that since it's easy to learn, and there is a free version out there that it attracts rookies who do not know what they are doing. But people who started off modeling in any other program understand what to look for and avoid.
Sorry, carry on.
For the O.P. Use normal maps if you have good quality ones, bump maps for slight textures that are not that pronounced, and displacement for things like stone or if you are viewing a surface close up at a lower angle, like that brick wall would look better with displacement vs bump. Just use the override to turn displacement off until your final render.