Hi Dave,
Thanks for the great info and response. What is "tube"? Is it some kind of liquid plastic that hardens into plastic? I understand what you're saying about it being hard to get. Would you mind telling me the name of the store(s) that you get it at? Don't worry, I'm in Dallas, and I'm sure I'm too far away from those stores to buy up any of your supplies - lol. Also, where do you get the wheels and tire combos from? A specialized hobby shop?
I must say, your models are really awesome, very professional looking. I've always loved glueing and painting the kits, but my talents are still not honed enough to hide the glue stains and paint runs - lol. Like you, I have not found any off-road model kits. The closest kits I've found are the rally race car kits made by Tamiya and sold at the hobby shops, but I'm sure you've seen your share of those when you go to the shops.
Keep up the excellent work on those models and take care,
Ed