Thanks for sharing your experience. Most people, including me, would have never thought about differences between CDL programs. What I see discussed the most are company demands your school provide 160 hours of instruction and/or be PTDI accredited. I believe recently or the near future any school not 160 hours long will not satisfy legal requirements got CDL.
one word of advice on dollar store type accounts. they are a challenge with regards to backing. No matter what take as much time as necessary, have store employees or customers move cars if they are in your way and have patience. Hitting something will only make things slow down more.