How about... instead of arms, four (or six) legs? Like a dog, but with retractable wheels at the bottom of the feet so it can go a bit faster on flat terrain but use the legs otherwise.

Hang on some sensors. For weapon systems, a small turret with a heavy machine gun and maybe a mortar. Or something.

In sum, a small jeep that you strap yourself into which can go through any terrain, if it so has to climb.

It wouldn't be as visible as a mecha for targeting. Some carrying capacity. It should be able to carry wounded on top.

Nah... it would be an inferior version of this:

http://en.wikipedia.org/wiki/Bandvagn_206