I'd try one in the front, and one in the back, before I would hang two out back.
I hate to tell this, but when I first started riding MX I had an AMC Gremlin ( very small 2door hatch back auto) and I would hang my CR125 on the bumper carrier loops and place my son's MR 50 in the back along with tools, gas can, riding gear and spare parts and that is how we went racing for a couple of years. We would drive several hundred mile just to get to a race in this configuration. Those were the days!
Paw Paw