It appears to me that a pretty good gain in mpg can be gained by driving at 60 mph with 6.0 in the Trail Lites. I have had vehicles with the 5.7 (350), 5.0 (305) and also 327,307 and 267 V8s and the 6.0 seems to have so much more torque but without the expected decrease in fuel economy. Perhaps the newer designed engine and fuel injection style and heavy duty 4spd OD lock up tranny make the difference. I hope to install a Scan Gauge to monitor some engine parameters. My guess is the torque curve and fuel flow and OD shift point rpm have a sweet spot around 58-60 mph.
I read elsewhere in the forum that Monaco will keep open the Warsaw IN plant in their downsizing plans. That is where the T/Ls where built. I toured it last year with the R-V camping club rally.