The main difference between the Draw-Tite Hitch # 75121 and the Draw-Tite Hitch # 41121 is the towing capacities of each hitch when a weight distribution system is being used. The # 75121 has capacities of 7,500 lbs GTW and 750 lbs TW when used with weight distribution, whereas the # 41121 can handle 10,000 lbs GTW and 1,000 TW when used with a weight distribution system.
I attached installation instructions that apply for both hitches for you to check out.
To complete your towing setup... view full answer...
The main difference between the Curt Reflex Trailer Brake Controller part 51130 and the Curt TriFlex Trailer Brake Controller part # C24VV is that the TriFlex has a triple-axis accelerometer with nine boost settings and the Reflex has a dual-axis accelerometer with four boost settings. The triple-axis accelerometer is going to provide more uniform braking than the dual-axis accelerometer and the extra boost settings are going to allow you to really fine tune the braking power output to... view full answer...