Route says no RV route using car route
I'm new to RV'ng and new to RV Trip Wizard so please bear with me.
I put a segment of my trip in the tool and it comes back and says it is not an RV route but for cars.
I checked the roads it has on the turn by turn list against the truckers road atlas and all the roads seem to be ok for semis so not understanding why it is giving me that error.
This is from Tishomingo, MS to Sweetwater / I-75 / Exit 62 KOA Holiday 269 Murray's Chapel Road, Sweetwater, TN 37874
Can someone help me understand what the issue is?