Fifth Wheel 101: A Technical Deep Dive with Big Truck Big RV

Ready to graduate from a pop-up to a fifth wheel? Big Truck Big RV's latest video offers a detailed introduction to fifth wheels, perfect for mechanically-minded RVers. Join us as we dissect the key components and systems of a fifth wheel, from hitches to electrical setups, with expert insights. Let's get technical and explore what makes these RVs tick!

Understanding Fifth Wheel Hitches: Goose Neck vs. Kingpin

The video begins with a comparison of fifth wheel hitch types, specifically focusing on the BMW fifth wheel to goose neck adapter. This adapter converts the traditional kingpin setup to a goose ball, which is often more convenient for pickup truck owners. "A lot of folks have moved to this style of connection versus that," notes the host, highlighting the appeal of easier hitching and unhitching. While a standard fifth wheel hitch provides a more secure "locked-in" feel, the goose neck adapter offers the benefit of not having to lift a heavy hitch in and out of the truck bed.

The BMW goose neck adapter featured in the video includes a Sumo Spring, a polyurethane bushing designed to absorb shock. This is a significant advantage as it reduces the shock load transferred from the truck to the fifth wheel frame, protecting it from potential damage. The host emphasizes the importance of using reputable brands for towing equipment, recommending names like BMW, Gen Y, Reese, and Kurt. These brands are known for their durable construction and reliable performance.

The host points out that the goose ball is a common 2 and 5/16 inch ball. While the goose neck adapter offers convenience, the video notes that traditional fifth wheel plates provide a bit more side-to-side stability due to the direct plate-to-plate contact. However, in most normal driving conditions, this difference is negligible. It's more important to pull over when experiencing extreme crosswinds to avoid dangerous situations.

Electrical Systems: Powering Your Home on Wheels

The video then dives into the fifth wheel's electrical system, showcasing a Cumins Onin QG5500 liquefied propane generator. This generator provides enough power to run all appliances inside the RV simultaneously. The host also highlights the use of a lithium iron phosphate battery to save weight, reducing it by approximately 80 pounds. This demonstrates a focus on optimizing the RV's overall weight and efficiency.

The electrical system includes a smart inverter and an MPPPT solar charge controller, which manages the voltage from the solar panels on the roof to prevent overcharging the battery. While the wiring may appear somewhat disorganized to some, the host explains that this is not necessarily indicative of a safety issue. He says, "It's messy if anything," noting that sometimes it can be easier to access specific wires when they're not tightly loomed. It's more of a cosmetic issue, not necessarily a functional one.

The host notes the wiring in RVs can range from very organized to very messy depending on the manufacturer. Newer units, like some Brinkley and Alliance models, often focus on wire looming and organization. The host contrasts the appearance of the wiring with the panel that houses the electrical equipment, joking that sometimes it's like a kid cleaning their room by shoving everything into the closet.

Plumbing and Water Systems: Ensuring Safe and Reliable Water

Moving on to the wet bay, the video showcases the RV's plumbing and water systems. The fifth wheel features a slide-out tray for easy access to sewer connections and water-related equipment. The host notes that this is a Moride product, a brand known for its high-quality components. The presenter's friend remarks on the quality, commenting on the "beautiful powder coating."

The plumbing system utilizes PEX tubing, which has become the industry standard. The host points out that the quality of PEX installations depends heavily on the installer's skill, particularly in crimping and cutting the tubing correctly. Some manufacturers are moving towards shark bite connections for easier installation and serviceability. The host also mentions that some brands are using brass fittings for increased durability.

To ensure safe drinking water, the RV is equipped with a Clear Source water filtration system. This system uses a high-micron filter to remove contaminants and bacteria from the water supply. The video also emphasizes the importance of using drinking water-safe hoses and maintaining water pressure below 60 PSI, ideally around 40 PSI, to protect the plumbing connections. The host recommends that dealerships should inform customers about the correct water pressure during the pre-delivery inspection (PDI) process.

Essential Accessories and Features

The presenter then showed off valves with quick connects for easier connection of accessories. He notes that quick connects are amazing to have in the RV world. The video highlights the importance of a power disconnect switch to prevent parasitic draw on the battery when the RV is in storage. Many newer RVs now come with solar power to maintain the battery charge, reducing the need for manual disconnection.

The host also mentions the possibility of performing a parasitic draw test using a meter to measure the current flow. He recommends installing a shunt on the battery to monitor the current in and out, especially with the use of Bluetooth-enabled batteries that provide detailed information on battery performance. This allows RVers to efficiently manage their power consumption and ensure reliable operation of their RV systems.

Key Takeaways

Goose neck adapters offer convenience: They eliminate the need to lift heavy fifth wheel hitches.
Shock absorption is crucial: Products like the Sumo Spring protect the fifth wheel frame from damage.
Electrical systems vary: Some RVs have well-organized wiring, while others prioritize accessibility.
PEX tubing is standard: Proper installation is critical for reliable plumbing.
Water filtration is essential: Systems like Clear Source ensure safe drinking water.
Power disconnect switches are important: They prevent parasitic draw and battery drain during storage.

Conclusion

This in-depth introduction to fifth wheels provides valuable insights for anyone considering upgrading from a smaller RV or tent camping. By understanding the key components and systems of a fifth wheel, you can make informed decisions when shopping for your next adventure vehicle. Be sure to watch the full video from Big Truck Big RV for even more detailed information and practical tips!