You'll probably get a Voucher if you miss meals during a Bustitution( not that Flex Meals on the Eaglete are anything to write home about).What's Amtrak policy re: sleeper's and bus substitutions?
Seems to happen often enough from sas to DFW that I'm wondering if I should just book coach to DFW then sleeper on to Chicago
The Eaglete CCC serves 2 Flex Meals, Breakfast and Lunch, between San Antonio and Ft Worth.
The ride up I35 on a Bus isn't exactly a joy ride, and can take as long as the Train does, so depending on your fare, the difference between Coach and Sleeper is up to what you feel is Value for Dollars spent.
With the current consist of the Eaglete( CCC, 2 Coaches and a Sleeper on the rear) I would just book Coach to Ft Worth. YMMV