A 100 gallon tank with some structure for them to hide (PVC pipe) would be fine for a temp QT tank, so the only real question is how well you trust your friends set up. Ich doesn't grow on tress, so either your friends system contains ich already, or it is ich free. Your call.
As far as moving, I never use bags for CL's, but with loaches that size I would most definitely be running an airline as 02 loss will happen quickly with large stressed out loaches, especially in an open container such as a cooler. A pinch of salt in the transport containers will also help with osmotic stress.