Toyota Motor Corp. had the best working relationship with its North American suppliers, according to an annual study from accounting firm Plante Moran, while Honda Motor Co. showed the most improvement, and views on Jeep-maker Stellantis NV soured. This year’s North American Automotive OEM-Supplier Working Relations Index was ripe for change given the supply-chain disruptions ongoing for more than a year that have halted vehicle assembly, depleted inventories and increased the costs of production. But the results, whose positioning was consistent with last year, show decreasing trust in those …