INDIANAPOLIS — One of my favorite cars is the green 1970 Buick Estate wagon, woodgrain and all, that co-starred in the movie, The Way Way Back. It’s a classic America family car so familiar to Baby Boomers and Gen-Xers. But, in a world of crossovers, wagons have taken a third-row seat to SUVs of all types. The Subaru Outback, built in Lafayette, Ind., is now the nation’s best-selling wagon. Somewhere between the Outback and The Way Way Back is a new-generation Buick wagon — The 2018 Regal TourX.