we have been using transflownow for over a year and love it. i can and have been sitting at the dock with less than 1/2hr before the cut off for payroll and got it in intime.
i have talked to drivers that said they have sent tranflo in at the trip pak and it worked but i havn't i use pilot or do it in the truck..
TA does not have Transflo, they have TripPak Express. A lot of companies that use Transflo also use TPE, but if your company only uses Transflo, and you attempt to scan at a TA, it won't make it to your company.
You can also get a fax number from your company in the event you cant get to a Transflow location. Not sure if there is downtime associated with processing the fax that will affect payroll deadlines.