Very nice! The jeep is a very usefull vehicle for warfare and because of its cheap design could be produced in vast numbers. If you want to use it in a normal game have it as a kind of light mobile infantry (Ive done a heavy mobile infantry- Some guys in a truck I belive the americans called it a deuce and a half) In modern war railroads make travel in your own lines very easy but as you cant use enemy improvements untill you have captured them, getting infanty reinforcements towhere they are needed can be dificult. Give it a moderate Attack and defence value (enough to put up a token defence) perhaps 4/6 and a movement value of either 1 with all terrain as roads or 3 (If you give it a move that is too high and make it too cheap you will spend all your time watching the A.I sending hordes of the things in to your territory in suicide dashes in atempts to pilage all your improvements/resources- this is not a realistic use of jeeps, so I recomend making it a adequate combat unit with a relativly high speed but no so high that they take up the whole game).