Watched an episode of "Home Town" on HG TV where Ben was restoring an old Airstream TT. He and his wife decided to install tile in the bathroom and shower. He said that you must use a silicone based thinset (adhesive) and a silicone based grout in order to let the tiles flex during the "mini earthquakes" associated with road vibrations and stresses.
'07 K3500 Silverado LT Crew Duramax (LBZ)
2016 Salem 27RKSS
1984 CHEV SCOTTSDALE K20 2GCGK24J0E1XXXXXX (Chevrolet Legends-Class of 2019)
"...exhaust fluid? We don't need no stinkin' exhaust fluid"