Garage drain for new house build

Your intention is to wash them inside your garage?

I like the idea of a garage drain regardless of the reason. frick it. Do it. 2" will suffice.

Do a prefabricated trench drain with traffic rated grate cover. You’ll need the frame and drain pipe on site when they form and pour the slab. Make sure you know what the invert of the drain should be relative to finished floor elevation of the slab and the invert of the receptor (so you can set the slope of the pipe)

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Why in the world do you want to wash your cars in the garage?

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Watched too many of those car recovery shows where they take barn finds covered in filth and power wash, hand wash and then polish the turds to make them somewhat presentable.

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Trench drain is a good idea. I'm thinking about putting one across my carport entrance when I have the driveway replaced. During very heavy rain I get some water backup. When your slab is poured include a moisture barrier everywhere including the garage. That will prevent damp slab problems if you coat the garage floor.

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Having added many catch-basins and 4" PVC runs to the rear ditch in Prairieville. I am a fan of drains. I dream of re-doing my driveway with trench drains across the garage door, carport, and random spots throughout. (Our driveway is fairly level with the yard, if not slightly below with the grass height. More drains are always better than less IMO.