The biggest U.S. automakers all beat estimates for domestic light-vehicle sales in May. General Motors Co.’s deliveries for the month were the best since 2007 while Fiat Chrysler’s were the highest in a decade as Memorial Day promotions helped boost demand. Fiat Chrysler Automobiles NV said U.S. sales rose 4 percent last month as deliveries of Chrysler 200 sedans soared, complementing demand for Jeep SUVs and Ram pickups. Ford Motor Co. deliveries slipped 1.3 percent, a smaller decline than analysts projected, while GM’s 3 percent gain topped estimates.