We are new to travel trailer life. We have a 2017 Ram Big Horn 1500 3.6L truck. Not sure of axle ratio. We bought the TT at Verinck in Grand Haven, MI. Verinck looked up the weight we could tow and said our C191MBSE KZ Connect would be fine. We can tow 10,000 lbs. Well, we drove home with the TT, it was fine. But we are nervous as we plan to visit Colorado. The truck websites base the tow weight on axle size and I fear we have the lowest. 4200lbs. Should we consider increasing the axle size from 3.21 to 3.55? That gives us 7200 lbs... Everyone says it will be fine but we do not want to cause damage to our truck or to others on the road.... signed, Living in Fear (Paul's wife)