The TSD program is completely awesome "IF" you can find a Love's truckstop near you. I saved over .40/gallon off retail. It really does not discount PFJ much at all (I think the PFJ RV discount is better) and T/A isn't much better. The good news is that there are NO fees. It's designed for a fill-up of at least 100 gallons but there is no penalty if you don't. However, if you don't, on a regular basis, I suspect you will be dropped as this costs the company money.
I have a 205 gallon fuel tank so taking on 100 gallons is a no-brainer. YMMV.