There's a draft version of one (a near future one?) in the Aldenata Playtest files but you need to be a Moot member. I don't think I can post the vehicle data block here.
Just doing a rough comparison of the two in real world terms I'd say either 1) use the jeep stats as suggested above or 2) jack up the jeep stats a touch and make it bigger. Use the actual speed and other real world stats. If need be run it through the design sequence though I'd not bother unless it'll be used a lot.