Best Hardware — top 25 on Amazon

#1

Oyviny 7 Pin Round to 4 and 5 Pin Flat Blade Trailer Adapter, 7 Way to 5 Way Trailer Plug Adapter 2-in-1 Design

$13.99 ★★★★½ 4.6

#2

Agrieyes TM8006C 7 Pin to 4 Pin Trailer Adapter | 7 Way Blade to 4 Way Flat Trailer Plug, Waterproof Connector for RV Truck Caravan Utility Tow Vehicles

$8.99 ★★★★½ 4.6

#3

GREPSPUD 4pcs 1.98'' Trailer Hub Dust Caps for 2000 3500 lb Boat RV Trailer | Spindle Bearing Grease Covers with Extra Rubber Plugs, Galvanized Dust Cups, Anti Rust, for Dexter EZ Lube Utility Trailers

$9.99 ★★★★½ 4.5

#4

AutoSonic 7 Pin Blade to 4 Pin Flat Trailer Adapter | Female Trailer Connector Plug | 7 Way to 4 Way Converter | Flat Connection | Weatherproof Design

$8.99 ★★★★½ 4.5

#5

Nilight Heavy Duty 7 Way Inline Trailer Plug Extension 8FT w/Junction Box | Waterproof 7Pin RV Round Wiring Harness Extend Vehicle and Trailer Side Towing Car Color Coded for Campers Caravans Vans

$31.98 ★★★★½ 4.6

#6

Oyviny RV 7 Pin Trailer Plug with IP68 Waterproof Seal, Detachable 7 Way Round RV-Style Trailer Side Connector 7 Point Trailer Wiring Plug

$13.59 ★★★★½ 4.6

#7

Nilight 7 Way Trailer Junction Box Weatherproof Color-Coded Studs | 7 Pole Waterproof Sealed Rubber Gasket for Rewiring Tidy Wiring Projects Camper RV Caravans Boat Cable

$8.54 ★★★★½ 4.6

#8

Trailer Light Tester, 7 Pin Trailer Plug Tester with LED | 7 Way Trailer Plug Tester for Diagnosing and Fixing Trailer Socket Circuit Problems

$7.99 ★★★★½ 4.5

#9

Pinailer Pack of 10 Trailer Pins – 2-3/4" x 1/4" (L x W) Trailer Hitch Pins | Featuring Shaft Locking Coupler Pins, PTO Pins and Lock Pins for Farm Trailers Towing, Lawn Equipment and Hitches

$9.99 ★★★★½ 4.8

#10

NBJINGYI Straight Trailer Coupler for 2" Ball and 2" Channel Tongue, 3500 lbs Gross Weight Capacity, E-Coated Black Steel for Boat, Utility and Equipment Trailers

$23.99 ★★★★½ 4.6

#11

Nilight Straight Trailer Coupler fits 2-Inch Hitch Ball, 2-1/2-Inch Channel | With security latch & chain, 3500Lbs capacity for Utility Cargo Trailer Station Wagon

$19.76 ★★★★½ 4.7

#12

Nilight 7 Way to 4-Way Flat Blade Trailer Adapter | Waterproof Rugged Nylon Housing 7 Pin to 4-pin Wiring Connector

$8.09 ★★★★½ 4.7

#13

CheeMuii 16" Double Tender Spring Kit & 3-IN-1 Semi Truck Air Lines Holder | Heavy Duty Galvanized Steel Double Tender Spring Kit with Air Hose Clamp for 3-in-1 Semi Truck Air Line Kit for Truck Trailer

$19.99 ★★★★½ 4.7

#14

MECMO 7 Way RV Trailer Light Connector Socket 7 Pin Wire Electrical Trailer Adapter Quick Converter with Mounting Bracket, Truck End Quick-Install 7 Prong Universal Pigtail Wiring Harness Vehicle Side

$18.99 ★★★★½ 4.6

#15

BFXM 4 Pin Flat to 7 Pin RV Blade Trailer Adapter with Mounting Bracket | Vehicle-Side 4 Way to Trailer-Side 7 Way, for Recreational Vehicle, Trailer, Truck

$12.59 ★★★★½ 4.8

#16

SWWLXH Premium 7 Pin Trailer Connector, Waterproof 7 Pin Trailer Plug | Heavy-Duty 7-Way Trailer Plug with Mount Bracket, Color-Coded Wiring Harness, Easy Install for RVs, Trailers, Boat Trailers

$9.69 ★★★★½ 4.6

#17

Pinailer Pack of 10 Trailer Pin – 2-3/4" x 1/4" (L x W) Trailer Hitch Pins | Featuring PTO Pins, Lock Pins, and Shaft Locking Coupler Pins for Farm Trailers, Towing, Lawn Equipment and Hitches

$8.99 ★★★★½ 4.8

#18

Nilight 4 Way Flat to 7 Way Round Blade Trailer Adapter Wiring Harness | 4 Pin to 7 Pin Electrical Connect Wiring Plug Connector with Mounting Bracket for RV Truck Factory Tow Package

$15.29 ★★★★½ 4.5

#19

OPT7 7 Pin to 4 Pin Trailer Adapter, 7 Way Blade to 4 Way Flat Connector | [SECURE TAB DESIGN] Trailer Light Adapter for Pickup Truck Tow Hitch, 3.75"x1.75"

$10.49 ★★★★½ 4.6

#20

Jiomrzo 7 pin to 4 and 5 Pin Trailer Adapter, Upgraded 2-in-1 Design | Weatherproof Trailer Light Adapter, 7 way round to 4 way and 5 Way flat Trailer Plug Adapter for RV Truck Utility Hitch Boat

$6.99 ★★★★½ 4.8

#21

METOWARE Straight Trailer Tongue Coupler, 2" Ball, 2" Channel, 3,500LBS | Heavy-Duty Steel Construction for Reliable Towing, Durable Zinc-Plated Finish Resists Rust and Corrosion, Easy to Install

$21.84 ★★★★½ 4.7

#22

MaxxHaul 50833 2 x 2 inch Trailer Hitch Receiver Extender 7 inch Hitch Extension Length 3500 Lbs GTW