We are planning a trip with our travel trailer and 3 kids for next summer and we will start in columbia South carolina. We are planning on 3 weeks to be gone. is it realistic to go all the way to yellowstone in wyoming and back a different route and actually see things along the way in 3 weeks. This will be our first time doing something like this. we have only camped with in 250 miles of where we live for a few days. Help please!!!!