You're just not used to driving the cars. Since most are driven by two wheels, go into the truck code. Find meshwheels or meshwheels2, then find the number after 9999,4. Change that to a 1 (if it's at 0 already).
material
0.335, 0.20, 0.205,14,72,74,9999,4,0,3,48,86000,1150, l, banditwheelGT_F.mesh burnwheelband
0.335, 0.20, 0.205,14,73,75,9999,4,0,5,48,86000,1150, r, banditwheelGT_F.mesh burnwheelband
set_beam_defaults 2150000, 200, 25000000, 3000000000, 0.02, gavrilinvis, 0.0
set_node_defaults -1, 0.99, -1, -1
0.335, 0.20, 0.205,14,80,81,9999,1,1,51,55,82000,1150, l, banditwheelGT_R.mesh burnwheelband
0.335, 0.20, 0.205,14,83,84,9999,1,1,53,55,82000,1150, r, banditwheelGT_R.mesh burnwheelband
;axles
;w1(80 81), w2(83 84), d(s)
Clear and regen cache and you're ready.