The contact owns a 2023 Mercedes-Benz Sprinter 3500. The contact stated while driving at an undisclosed speed, the accelerator pedal was depressed, however, the RV failed to accelerate as intended. In addition, the contact noticed a burning odor in the interior of the RV. The RV was driven to the shoulder of the road. The contact and the contact's husband exited the RV. The contact stated that the RV burst into flames. The fire department arrived and extinguished the fire. The contact stated that a fire report was filed. The RV was towed to a tow yard. The manufacturer was made aware of the failure. The contact stated that Winnebago is scheduled to complete an inspection in the next few days. The failure mileage was approximately 4,400.