Zane Merva Executive Editor / Publisher, GM-Trucks.com March 22nd, 2019   The all new Chevy Suburban & Tahoe along with the all new GMC Yukon have been caught testing on public roads once again. We've licensed these images so we can show you the very first look at production lighting for these future 2020 model year vehicles.    The last time we saw pre-production models of GM's full-size SUVs was last fall when the 2020 Tahoe and Yukon were caught on film for t