yes it is tubbed. It has 15 x 14 inch welds with 33 inch x 19.5 Mickeys on it now. My plans in the future are to go with a 20. I was told they are making them wider now. I think it would look awesome with some 20x14's on the back, I have also seen on this board a company that is making a tire that is 29x18.5x20 how cool would that be!!!! but like you said it's only money.
Look at a post by Layedoutnoma. It shows the 29x18.5x20's on a 67 -72 pickup. N2TRUX directed me to it a while back. Be careful though if you see them you'll want a set.
The thread is
http://67-72chevytrucks.com/vboard/s...d.php?t=211015