If it was realistic, it wouldn't be my *dream car*; It would just be the ride I'm working on. Sorry, I've been paying too much attention to those TTTT guys.
They've got some cool toys!!
Ok, since you're wanting something that's physically possible.... How about a 1/87 scale 'MAN 5 ton' (2 axle) painted to look like blue-dyed snow cammoflage. Or a 1/87 scale 'Rosenbauer Panther FL' airport crash truck.
Articulating, spring-suspension. Stiff enough gearing not much will stand in it's tiny way. 4 wheel drive. Digital propo throttle and steering, with selectable frequencies....