Welcome to the forum.
Not exactly on point, but we had a 17 Discovery LXE 40D. Never went back to the dealer for any problems. Had 3 recalls, one on the awning, the way it was mounted, Girard. Brake caliper bolts, and a last one still outstanding, on the engine control module, both Freightliner items. Last time I checked, Freightliner hadn't developed the replacement module yet.
All the small items, like the transmission cooler leak that needed the hose clap repositioned, I take care of myself.
We just recently traded the 2017 for a 2019 Discovery LXE 40M floorplan that better suited our needs and totally expect to experience the same satisfaction. If the 40G model satisfies your needs, I think you'll be satisfied with your choice.
2019 Fleetwood Discovery LXE 40M w/2012 CRV toad