A friend of mine used to play college tennis (I believe D3) and plays at the 4.5 level now, but he's definitely put on some weight. So the caveat here is that he used to be a pretty good player before the weight gain happened. Anyways, he pretty much plays "blast every ball" style of tennis from the baseline and goes for winners on every shot. He's accepted the fact that he's going to produce tons of errors and winners and pretty much camps out left side of the baseline to hit forehands, and he'll mostly take educated guesses to "cheat" to one side if he has to play defense. If you are right handed, he will hit hard inside-out forehands to your backhand and dare you to go for the open court down the line, and if you do hit it, he's good for exactly one run-down to try and rip a running forehand winner. He will lose to anyone who can consistently hit the angles to his backhand or pull drop shots off his heavy groundstrokes which is easier said than done. But he's okay with losing that way, so be it. He's pretty much fully accepted his movement-related limitations and doesn't get discouraged when the limitations cause him to lose points and sticks to his game plan.
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