What Is the Industry Standard Fifth-Wheel Height in Inches?

A fifth-wheel trailer is a type of travel trailer that is towed by a pickup truck using a special fifth-wheel hitch that is mounted in the bed of the truck. The fifth-wheel gets its name from the similar coupling on four-wheeled horse-drawn carriages. Determining the industry standard height for fifth-wheel hitches and trailers is important for ensuring proper vehicle compatibility, meeting regulations, and maintaining safety on the roads.

In essence, fifth-wheel trailers come in a broad range of sizes, spanning from compact 12-foot (144-inch) models to substantial units exceeding 40 feet (480 inches) in length. But the fact is the overall trailer height should not exceed 13 feet 6 inches (162 inches). However, the industry-standard height suggests the range from 147 inches to 162 inches, and 155 inches is considered the average height.

As an owner and operator of fifth-wheel trailers for over 15 years, I have extensive experience measuring and working with these trailers. Now I’m about to provide a detailed overview of fifth-wheel trailer specifications, explain the relevance of industry standards, and outline the key factors that influence standard measurements. Also, I’ll specify the role of manufacturers and regulations in height determination, discuss variability in standards, list common heights used in the industry, demonstrate proper measurement techniques, and more. So, stick to the post till the end.

What Is the Industry Standard Fifth-Wheel Height in Inches?

Overview of Fifth-Wheel Trailers Height

A fifth-wheel hitch mounts a special kingpin on the trailer to a mount anchored securely to the frame of the tow vehicle, typically a pickup truck. This allows for a more stable and secure connection than conventional ball hitches. As I’ve told you, fifth-wheel trailers range from small 12-foot models to massive 40+ foot units.

Source: thorindustries

They are popular for recreational travel, especially among full-time and seasonal RV enthusiasts. The height from the ground to the inside surface of the fifth wheel hitch is a critical measurement for proper vehicle pairing. But to maintain a fit fifth-wheel, the height should be less than 162 inches (155 inches I recommend).

Importance of Standard Fifth-Wheel Height

Having an established industry standard fifth-wheel height allows for universal compatibility between different model trucks and trailers. It ensures that fifth-wheel hitches are neither too high nor too low when mounting the trailer. Consistent height also helps meet various state regulations regarding maximum trailer height while in transit on highways. Standardized measurements are crucial for safety, preventing accidents from improper connections, overloaded tow capacity, or other issues related to non-compatible trailer and tow vehicle pairings.

Factors Influencing Standard Fifth-Wheel Height

Several key factors determine what the ideal fifth-wheel height in inches should be as an industry-standard –

Vehicle Compatibility

The height must match typical truck bed heights for proper mounting and towing capacity.

Regulations

State laws establish maximum height restrictions for vehicles and trailers on public roads

Safety

Adequate clearance under the trailer and appropriate weight distribution improves stability in transit.

Practicality

The height should allow easy hooking/unhooking and access to connections for operators.

Measurement Specifications

The most common specification for fifth-wheel height given by manufacturers is measured from the level ground surface up to the inside top surface of the fifth-wheel mount in the pickup bed. This measurement assumes any standard pickup truck and fifth-wheel trailer combination. Precise measurements should be taken from both the front and rear of the fifth-wheel mount and averaged to account for any inconsistencies in the truck bed or camper mounting surface.

Here’s a table of exterior heights for example to make things more convenient:

Model	Floor Plan	Exterior Height	Exterior Height (Inches)
Open Range Highlander	HF327G	13′ 1″	157
Flagstaff Classic	85291KSB	13′ 2″	158
Grand Design Reflection	29RS	12′ 3″	147
Heartland RV Big Horn	3375 SS	13′ 3″	159
Palomino Columbus	328RLC	12′ 4″	148
Forest River Riverstone	381FB	13′ 4″	160
Keystone Alpine	3321MK	13′ 4″	160
Keystone Montana	3120RL	13′ 4″	160
Starcraft RV Telluride	251RES	12′ 5″	149
Dutchmen Astoria	2503REF	12′ 5″	149
Coachmen Brookstone	344FL	13′ 5″	161
Northwood Arctic Fox	32-5Z	13′ 5″	161
Jayco North Point	383FKWS	13′ 5″	161
Forest River Wildcat	290RL	12′ 6″	150
Luxe Fifth Wheel	43MD	13′ 6″	162
Jayco Pinnacle	38FLWS	13′ 6″	162
Pacific Coachworks Sea Breeze	26FSB	11′ 8″	140
Crossroads Cruiser	CR3311RD	12′ 8″	152
Northwood Fox Mountain	235RLS	12′ 9″	153
K-Z Durango	D321RKT	12′ 9″	153

Note: These are examples of average heights.

Compliance and Regulations

In the United States, the federal government has not issued nationwide regulations regarding fifth-wheel trailer height. However, individual states often implement height laws related to maximum vertical clearances on roads and bridges. For example, bridges with lower clearances may require limiting trailer heights. Meeting state height compliance helps prevent collisions between the trailer top or load and bridges or overpasses. Proper fifth-wheel height improves road safety for all drivers.

Variability in Fifth-Wheel Height Standards

Some variability exists globally in fifth-wheel measurement standards. For example, Canada and Australia follow different guidelines than the common U.S. standard height. Additionally, different truck and trailer manufacturers may use proprietary custom mounting systems that deviate slightly from industry norms. Minor height differences may also occur to accommodate specific load weights. However, most fifth-wheels intended for recreational consumer use adhere closely to the prevailing standard.

Common Fifth-Wheel Heights

After consulting numerous truck and fifth-wheel trailer manufacturer specifications and measuring countless trailers firsthand, the average standard fifth-wheel height is 17 to 19 inches. This range allows suitable clearance for road travel while matching well with standard pickup truck configurations. Specific popular fifth-wheel models that meet the standard specifications include the Keystone Montana, Jayco Eagle, and Grand Design Reflection.

How to Measure Fifth-Wheel Height

Use the following straightforward technique to accurately measure fifth-wheel height yourself –

Step 1: Park the trailer and tow the vehicle on a flat, level surface.

Step 2: Measure from the ground to the inside surface of the fifth-wheel mount using a tape measure. Take measurements at both the rear and front corners.

Step 3: Average the two measurements to account for any inconsistencies in the mounting.

Step 4: Verify that the measurement falls between 17 and 19 inches.

Step 5: Adjust the fifth-wheel hitch mounting height as needed to meet specifications.

Correct tools like a long tape measure, stepladder, and carpenter’s level help obtain precise fifth-wheel height measurements. Taking consistent measurements over time can also identify any shifting or changes needing adjustment in the fifth-wheel mount to restore proper height.

End Note

Adhering closely to the prevailing fifth-wheel industry standard height between 147 inches and 162 inches is vital for safe and compatible truck and trailer pairings. Minor deviations may occur among truck bed configurations, but most systems are engineered to keep custom fifth-wheel hitches as close to the standard as possible. Maintaining the proper measurement ensures highway regulations are met, drivers stay safe, and optimal capability is achieved from fifth-wheel recreational trailers. As industry specifications continue evolving, I anticipate fifth-wheel mounting standards will remain focused on maximizing safety through rigorous testing and design improvements.