ktosv - thanks for the weight & ratio info, that really helps.
APT - I'd love to find a 6.0, 454 or 8.1, but they are really hard to find, and I'm not worried about gas mileage.
We are going to buy an older used vehicle cause we recently got completely out of debt, paid off house, car and TT with some estate money from mom (we watched our credit rating plummet after we did that, but don't care). We are not going to finance anything ever again, but don't have a lot of cash left. So, the problem with that is finding a Suburban or van with the 6.0 that has around 150,000 miles and is in decent shape. Lot of em out there with 250,000 miles, have torn up seats or just plain stink inside.