Did you see the size of that airframe? There simply wouldn't be much space to shoehorn in a conventional landing gear. Besides the thing was a powered glider, and I imagine they would suppose that at landing time with the fuel expended remaining weight and wing loading would allow for low landing speeds.

All gliders with only a few exceptions had skids, even the great Hamilcar. Only larger gliders had wheels (Me 321), the Gotha 242 and the Waco CG-4 had both wheels and skids, I presume as a safety measuer when the regular landing gear broke on a tough landing.

The Me 163 took off on a wheeled dolly dropped right after take off.

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