Caution when entering GSM NP thru Wears Valley

Being from Texas I did not have any prior knowledge of the area. My Garmin Nuvi GPS provided that route. It would have been a very pleasant route if not for the trailer. I am not aware of any GPS that would have provided me prior knowledge of the very tight turn. I never saw any "No Truck" or other warning signs. More importantly, No one seemed to care at the N.P. A warning sign at the entrance to the park and a proper turn-around area would have been very helpful.