Measuring a fifth wheel trailer accurately is crucial for ensuring safe towing, selecting the right tow vehicle, and complying with regulations. The key measurement is the overall length, determined by measuring from the extreme front of the fifth wheel trailer (usually the pin box) to the extreme rear (typically the bumper). However, other dimensions like height, width, and pin weight are equally important for a complete understanding of your trailer’s specifications and its compatibility with your tow vehicle.
Understanding the Importance of Accurate Measurements
Accurate measurements of your fifth wheel trailer are vital for several reasons:
- Tow Vehicle Compatibility: Matching your tow vehicle’s capabilities to the trailer’s weight and dimensions is paramount for safe and efficient towing.
- Legal Compliance: Length and height restrictions vary by state and province. Accurate measurements ensure you remain compliant with local laws, avoiding fines and potential safety hazards.
- Campsite Reservations: Many campgrounds have size restrictions for RV sites. Knowing your trailer’s exact dimensions helps you secure a suitable campsite.
- Storage Considerations: Whether storing your fifth wheel at home or in a dedicated storage facility, accurate measurements are essential for planning and accommodating its footprint.
- Insurance and Registration: Insurance companies and registration agencies often require precise trailer measurements for accurate policy creation and vehicle registration.
Key Dimensions to Measure
While overall length is the most commonly sought-after measurement, it’s essential to consider other dimensions for a comprehensive understanding of your fifth wheel trailer.
Overall Length
As mentioned previously, the overall length is the measurement from the front of the pin box to the rear bumper. This measurement is critical for campsite reservations, storage planning, and ensuring compliance with length restrictions. To obtain the most accurate length, use a long measuring tape or laser distance measurer.
Overall Height
The overall height is measured from the ground to the highest point of the trailer, usually the top of the air conditioner or any other roof-mounted equipment. This measurement is crucial for avoiding low bridges and overpasses. Remember to measure on a level surface.
Overall Width
The overall width is measured from the widest point of the trailer, including any protruding features such as awnings or slide-outs when retracted. Width restrictions are strictly enforced on many roadways.
Pin Weight
Pin weight (also known as hitch weight) is the weight exerted by the fifth wheel hitch onto the tow vehicle. This is a critical factor in determining if your tow vehicle can safely handle the trailer. It is best determined using a commercial scale. Weigh the tow vehicle alone, then weigh the tow vehicle and the fifth wheel connected. The difference is the pin weight.
Gross Vehicle Weight Rating (GVWR)
GVWR is the maximum permissible weight of the trailer when fully loaded, including cargo, water, and passengers. This information is usually found on a sticker on the trailer’s exterior. Exceeding the GVWR can lead to serious safety issues.
Unloaded Vehicle Weight (UVW)
UVW is the weight of the trailer as it leaves the factory, without any cargo, water, or passengers. This figure is also typically found on a sticker on the trailer.
Cargo Carrying Capacity (CCC)
The CCC is the maximum allowable weight of cargo, water, and passengers that can be added to the trailer. It is calculated by subtracting the UVW from the GVWR.
Tools and Techniques for Accurate Measurement
Obtaining accurate measurements requires the right tools and techniques.
- Measuring Tape: A long measuring tape (at least 50 feet) is essential for measuring length and width.
- Laser Distance Measurer: For added accuracy and ease of use, consider a laser distance measurer, particularly for measuring height.
- Level: Ensure the trailer is level when measuring height for the most accurate result.
- Scale: A commercial scale is the most accurate way to determine pin weight. Local truck stops or weigh stations often have these available.
- Assistant: Having an assistant can make the measuring process easier and more accurate, especially when using a long measuring tape.
Frequently Asked Questions (FAQs)
FAQ 1: Where can I find the official specifications for my fifth wheel trailer?
The official specifications, including length, width, height, UVW, GVWR, and CCC, are typically found on a sticker located on the exterior of the trailer, often near the entrance door or on the sidewall. You can also consult the owner’s manual or contact the manufacturer directly.
FAQ 2: How do slide-outs affect the overall width measurement?
Slide-outs do not affect the overall width measurement because you need to measure with the slides retracted, as that is the legal road-going width.
FAQ 3: Is it necessary to measure my trailer if I already know the advertised length?
Yes. Advertised lengths are often approximations. It’s always best to measure your trailer yourself to ensure accuracy, especially for campsite reservations and legal compliance.
FAQ 4: How accurate do my measurements need to be?
Aim for accuracy within a few inches, particularly for length and height. Even minor discrepancies can have a significant impact on clearance and compliance with regulations.
FAQ 5: What happens if I exceed the legal length limit for my trailer?
Exceeding the legal length limit can result in fines and may even prohibit you from traveling on certain roads. Always check local regulations before embarking on a trip.
FAQ 6: How do I measure pin weight if I don’t have access to a commercial scale?
While a commercial scale is the most accurate method, you can use portable scales designed for weighing trailer tongues. These scales can provide a reasonable estimate of pin weight. However, remember that these are less accurate than a commercial scale.
FAQ 7: Does adding accessories like a ladder or spare tire affect the overall length or height?
Yes, adding accessories can potentially affect the overall length or height of your trailer. Re-measure your trailer after adding any significant accessories to ensure accuracy.
FAQ 8: Where can I find information on state and local length and height restrictions?
State and local transportation departments provide information on length and height restrictions on their websites or through printed guides.
FAQ 9: How often should I measure my fifth wheel trailer?
It’s a good practice to measure your fifth wheel trailer at least once a year, or whenever you make significant modifications or additions that could affect its dimensions or weight.
FAQ 10: Are there any online resources or tools that can help me calculate my trailer’s weight and dimensions?
Several online calculators and resources can help estimate your trailer’s weight and dimensions. However, these tools should be used as a guideline only, and it’s still essential to physically measure your trailer for the most accurate results.
FAQ 11: What is the difference between GVWR and GCWR (Gross Combined Weight Rating)?
GVWR refers to the maximum permissible weight of the trailer alone, while GCWR refers to the maximum permissible weight of the tow vehicle and the trailer combined.
FAQ 12: If my trailer has a generator, does the fuel in the generator tank contribute to the CCC?
Yes, the weight of the fuel in the generator tank, along with any other fluids (water, propane) and cargo, contributes to the CCC. It’s crucial to factor in these weights to avoid exceeding the GVWR.