Qingdao Tune Technology Co., Ltd. builds 1-Stall Restroom Trailers at its 4,500-square-meter production site in Shandong, China. This is the smallest unit in the Stall Restroom Trailer range, which also covers 2-stall, 3-stall, 4-stall, and 6-stall models. A single-stall trailer is used at private weddings, film sets, corporate retreats, and garden events where one private restroom is enough and a larger unit would take up too much space. It tows behind a standard SUV or light truck and can operate without a water or sewer connection. Where the site also needs washing facilities, a Shower Trailer can be placed alongside it.
The trailer measures about 3.6 meters in total tow length and 1.8 meters in width, which allows it to fit behind hedges, vineyard arbors, or VIP lounge tents. Because the unit is compact, it can be positioned close to the event without blocking walkways or service access. The single-stall layout gives each guest full privacy, and there is no queue shared with other users. The exterior can be finished in white, black, or a custom color to match the venue.
The interior uses a vitreous china pedal-flush toilet that consumes under 0.5 liters per flush, which extends the waste tank interval. A solid-surface quartz countertop holds a deep stainless steel sink with a touchless infrared sensor faucet and a wall-mounted automatic soap dispenser. Vanity lighting is soft and ambient, and the unit can include real hardwood cabinetry and a full-length dressing mirror. Seamless commercial-grade vinyl sheet flooring turns up 100 mm at the wall base, creating a sealed, waterproof surface that can be washed down. The result is a restroom that reads as a residential bathroom rather than a portable unit.
A food-grade 120L freshwater tank feeds a 12V automatic diaphragm pump delivering 3.5 GPM at 45 PSI. Below the subfloor, a rotationally molded 150L HDPE waste tank includes an integrated bottom macerator pump and a standard 3-inch RV dump valve. This setup supports over 120 uses per fill. Where a municipal supply and sewer connection are available, external quick-connect ports allow the trailer to be tied into site utilities instead of using the onboard tanks. Tank levels can be monitored so the unit is serviced before it fills.
The body uses 40 mm composite sandwich panels insulated with high-density flame-retardant polyurethane foam at 42 kg/m³, giving an overall R-11 rating. A low-profile 13,500 BTU rooftop air conditioner handles summer heat, and a 1,500W electric convection wall heater handles winter cold. Internal PEX water lines run through heat-traced insulated subfloor channels, which prevents freezing during sub-zero deployments down to about -15°C. This makes the trailer usable across seasons rather than only in mild weather.
The chassis is a heavy-duty steel frame treated with hot-dip galvanization to resist underbody corrosion from road salt, mud, and liquid runoff. The engineering team uses 3D CAD/CAM modeling to set axle weight distribution. The trailer runs on a single 1,500 kg torsion axle with electric drum brakes and 14-inch radial tires. A standard 2-inch ball coupler, heavy-duty drop-down leveling jacks, and DOT/CE-certified LED tail lights are fitted. This combination keeps the trailer stable at highway speed and easy to level on uneven ground.
The unit can be specified with a freshwater tank upgrade, a larger waste tank, a cassette toilet instead of the pedal-flush model, or a 110V/220V dual-voltage breaker panel for different markets. A handwash station upgrade and a baby changing table are also available. Buyers who need two or more private restrooms should compare the 2-stall, 3-stall, 4-stall, and 6-stall models in the same range. Each larger model uses a tandem or triple-axle frame and a proportionally larger waste tank.
Before shipment, each trailer goes through a 12-hour continuous hydrostatic pressure test on all water lines and a 50 PSI rain chamber spray test across doors, roof seams, and service access hatches. The 110V/220V breaker panel and LED road lighting undergo dielectric insulation and ground-fault circuit testing. After approval, the trailer is wrapped in protective transport film and packed for ocean freight. TUNE provides a 12-month structural factory warranty and technical plumbing schematics.
1-Stall Restroom Trailers can be supplied with CE, ISO 9001, DOT, EPR, COC, and NSF-aligned documents where required. TUNE holds Alibaba Gold Supplier status and has completed regular third-party inspections by SGS and Intertek. Certificate numbers, scope, and validity can be provided before ordering.
Q: How many uses before the waste tank needs servicing?
A: The 150L waste tank supports over 120 uses per fill, depending on flush volume and the number of guests. The pedal-flush toilet uses under 0.5 liters per flush, which extends the interval.
Q: Can it work without a water or sewer connection?
A: Yes. The trailer carries its own freshwater and waste tanks, so it runs self-contained. Where site utilities are available, quick-connect ports allow direct connection instead.
Q: Can it be used in winter?
A: Yes. The R-11 body, 1,500W convection heater, and heat-traced water lines allow operation down to about -15°C. Below that, additional insulation or a heated enclosure is recommended.
Q: What vehicle is needed to tow it?
A: The trailer runs on a single 1,500 kg torsion axle with electric drum brakes, so a properly equipped SUV or light truck with a brake controller can tow it.
Q: What after-sales support is included?
A: TUNE offers a 12-month structural warranty, remote technical support, and shipment of common spare parts such as pumps, faucets, macerator components, and electrical switches. Specific terms are stated in the contract.
