with the after market hitch being so low, I'm thinking its probably comparable to what you were using on your minivan. I'm thinking of going with a this - as seen on etrailer - which should give me another couple inches.
Product Summary:
Ball Mounts
Fixed Ball Mount
Standard Ball Mount
Standard
Steel
Product Specs:
2-3/4 Inch Rise
4 Inch Drop
Fits 2 Inch Hitch
Class III
6000 lbs GTW
Hollow Shank
Draw-Tite
flipped upside down - I'm thinking that should do the trick. If you think differently or know from experience please let me know. Funds are tight!