On check with the
Michelin website, both sizes have the same load capacity, but the 245/75 have a smaller diameter which change your speedometer/odometer readings, but the biggest concern would be the additional space (almost and inch) required between the rear duals, to prevent kissing or rubbing between the two tires.
Beverley and Ken
2006 Winnebago Outlook 29B E-450.
2012 Honda CR-V AWD
Blue Ox Aventa LX tow bar and Brake Buddy Vantage.