I think they call it a "quick box"? If you look at the cover it has plastic veins designed to push the wires in and hold in place. Im not crazy about them but im sure most RV's have them installed from factory.
They dont have to strip the wires, just insert and the box will cut the insulation and make contact with the wires once the cover is tighen in place.
2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, TPMS, Surge tank, Tornado flush, Viair Compressor