Psh, I LIKE those big tires, haha. Though I'm a Mickey Thompson Baja Claw fan myself..
Well, I ordered the seats for real cheap from a company (about $80 when they are easily in the mid hundreds). I waited and waited for about 4 months or so, and finally cancelled the order since I hadn't gotten them. Then, a week later, I get the seats in the mail to my suprise. I call them back and tell them, and they tell me to just keep 'em...for free. Didn't even pay shipping, haha.
Actually, I feel that the AMC 20 is stronger (when beefed up a little) than the D44. That's for the back though. For the front, I agree that you will need something bigger and beefier up there.
I've still got the 30 up front: