As someone who rents trucks somewhat often check out Penske.
Also, are you willing to fly out and get a truck?
Are you flexible on dates?
For example, South Bend to Grand Rapids with a 26' Penske truck is $999, same truck on the same date from Nashville to Grand Rapids is $99 (not a typo).
Also, ALWAYS get insurance, the roof on a 16' Penske truck is over $6000 to replace (Penske rep told me).
$6k was just the roof, not the sides or any structure, it's just crazy.