Put the Magic Carpet in the Red Wagon and have the Sawhorse take you and the Wizard to the edge of the desert.

While you are gone, Dorothy, I'll watch you in the Magic Picture, and if any danger threatens you I'll see you are not harmed." Dorothy thanked the Ruler of Oz and kissed her good-bye, for she was determined to start at once.

She found the Wizard of Oz, who was planting shoetrees in the garden, and when she told him Inga's story he willingly agreed to accompany the little girl to the Nome King's caverns.

They had both been there before and had conquered the nomes with ease, so they were not at all afraid.
The Wizard, who was a cheery little man with a bald head and a winning smile, harnessed the Wooden Sawhorse to the Red Wagon and loaded on Ozma's Magic Carpet.

Then he and Dorothy climbed to the seat and the Sawhorse started off and carried them swiftly through the beautiful Land of Oz to the edge of the Deadly Desert that separated their fairyland from the Nome Country.
Even Dorothy and the clever Wizard would not have dared to cross this desert without the aid of the Magic Carpet, for it would have quickly destroyed them; but when the roll of carpet had been placed upon the edge of the sands, leaving just enough lying flat for them to stand upon, the carpet straightway began to unroll before them and as they walked on it continued to unroll, until they had safely passed over the stretch of Deadly Desert and were on the border of the Nome King's dominions.
This journey had been accomplished in a few minutes, although such a distance would have required several days travel had they not been walking on the Magic Carpet.