But there is one other system in play right here. You might discover one of the letters of the alphabet on your tire, say D or E and so forth. Since D is the fourth letter, you multiply 4 by2 to seek out that a D load rated tire is equal to a 8 ply tire,. Base Plate: Personalized in your tow vehicle, it attaches the tow bar. Braking System: Essential for security, it synchronizes the towed vehicle’s brakes with the RV. Security Cables: Backup if the tow bar fails. Wiring Harness: Integrates lights and indicators. Without these, you threat harm and accidents. Selecting the best car is essential. It’s not nearly towing capacity—though that’s critical—but also warranties and manuals