I was thinking the same on the maxx also and seems I got the same nitro stampede as you. Mine had same tires but white dish wheels. A few months ago, I thought about buying a traxxas .12 off ebay for the stampede but never did.
Nice collection you have. I too have a 90s Nitro stampede. How often do you drive these?
My Nitro Stampede has a tan chassis, and I bought it around 2014 for $50. I also have a first gen tmaxx .15. After those I'm 03 and prior.