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Before spending thousands on a NEMA 14-50 connection to your carpark investigate a simple upgrade to a NEMA 5-20 (16amps max at 120V) by changing the plug and breaker, or a NEMA 6-15 (12A max at 240V) or a NEMA 6-20 (16A max at 240V). It's possible that any one of these might be doable for the cost of a new breaker and plug, depending on your existing wiring.
If you have to run new wire, then a NEMA 5-20 (which is backward compatible with standard 120V devices) might be most cost effective because it's so versatile, The NEMA 6-15 and 6-20 outlets are going to be dedicated 240V outlets but the thinner wire required will reduce the cost of the installation.
I looked into this, but all the 15A outlets in my house are wired with 14ga, which is not enough for 6-20.