The SGC doesn't necessarily need to focus on fighting vehicles. Their primary goal is exploration. It's usually send a MALP to see if the area is clear and explore a larger territory on foot. Just use a buggy or MULE. Use a MALP or UAV to see if the area is clear then ride the MULE to explore an even larger territory than on foot. I've only seen stargate use vehicles twice: a gun-mounted MULE in Forever in a Day and a Go cart full of equipment in SGA Duet. So they can get vehicles through the gate.
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