The goal is to conserve max volts at max amps. A voltage loss of 1% or less is ideal. See:
Voltage Drop Calculator
Most converters have a direct female socket to plug in bare wire. Either trim some strands or add 2 inches of a lesser gauge that fit soldered to the fatter wire to fit if needed.
1998 Kit 23' TT, 210 AH, PM4B-45, RV-30S PWM, 280w solar, Trimetric, Wave 3, Samlex PST-150w
2004 Nissan Titan 4x4 with Tow, Hellwig helper springs, Banks Catback