I would be happy to make a recommendation for you.
For a trailer brake controller I highly recommend the tried and true Tekonsha Prodigy P3 # 90195 due to its easy to read LCD screen, built in diagnostics that are easy to understand, and it being a proportional controller meaning the trailer brakes will be applied with the same intensity that you apply the brake pedal.
To power the P3 # 90195 your 2007 Internation Trucks 4100 Dump Truck will need to have a 7-way RV connector installed.... view full answer...