Firstly, they should be more realistic about how hectic mobile schedules are, but they do tell you that every day is different shifts. They will not promote you to TL unless you hold a CDL license and they push DSS to get it also. However, you are able to decline. After they discuss availability, they will ask multiple questions about how you would handle different situations in the field ( coworker error, unruly donor, own mistake, etc.)