I've caught a lot of crappie trolling for stripers in Texoma in the past. I've been surprised many times at how big a lure some crappie will take. A Chartreuse crankbait will quit often be irresistible to a big crappie.
Texoma was not good for crappie this year. I only caught a few before it went muddy. Last year was pretty good for trolling
I think trolling is not a good tactic for getting a limit of crappie but you'll get some big ones.
before the flood I could always count on catching a few crappie with the stripers. Your speed needs to be between 1.5 - 2 mph max to get the crappie