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Start with what needs to get through
Measure the machine or vehicle in the configuration you will actually move through the door: mirrors, tyres, roof equipment, exhausts, folded booms, buckets and attachments included. Record maximum width and height, plus the space needed to turn and approach the opening. Use the equipment you own and the next machine you expect to buy.
The examples below are planning references from the earlier guide, not a fit guarantee or a substitute for your model’s measurements. Attachments and transport settings change the envelope.
| Equipment | Transport height | Transport width | Recommended clear opening height |
|---|---|---|---|
| Pickup with topper / utility trailer | ~7 ft | ~7–8.5 ft | 9 ft |
| Compact / utility tractor with cab | ~8–9 ft | ~6–7 ft | 11 ft |
| Row-crop tractor, cab, loader lowered | ~11–12 ft | ~8–10 ft | 13 ft |
| Self-propelled sprayer, folded | ~12 ft 6 in | ~12 ft | 14 ft |
| Class A motorhome / fifth-wheel RV | up to 13 ft 6 in | ~8.5 ft | 15 ft |
| Tandem grain truck, box down | ~12–13 ft | ~8.5 ft | 15 ft |
| Air drill / air seeder, folded | ~13–15 ft | ~16–18 ft | 17 ft |
| Large combine, header off (e.g. JD S680) | ~16 ft 6 in | ~17 ft 8 in | 18 ft |
Compare the opening with the exact building
The published 30′ family elevation reference is approximately 14′ × 13′ (4.27 × 3.965 m). The 40′ family reference is approximately 18′ × 14′ 1″ (5.49 × 4.30 m). The 50′ family reference is approximately 18′ × 16′ (5.49 × 4.89 m). These are drawing references; MAX confirms usable clearance for the supplied model and door hardware.
Do not extend one family’s opening to every width, height or door option. Send MAX the exact building size and required clear opening. The supplier must check the truss geometry, end-wall layout and door arrangement together.
When a custom door makes sense
A larger winch opening can be requested up to 20′ × 20′ if the frame permits. A 20′-high request will not fit every profile. Sliding doors offer more flexibility, but their opening, supporting frame and operating space still require a specific design and quote.
In MAX Express, first choose the building size and fabric. The summary shows the standard door reference. Use Request a custom door size to enter the usable width and height you need. The request preserves your dimensions and goes to MAX for a fit check and price before payment.
Allow room for the approach and the work inside
A vehicle can clear a door on level ground yet need more room on a sloped approach. Plan turning space outside, door operating space and a clear route inside. Leave practical clearance around mirrors and attachments rather than treating a close numerical match as sufficient.
The roof slopes down from the peak, and trusses occupy space. Check usable height where equipment will actually sit or move, not only at the centreline. More building length adds storage area but does not increase door clearance. Keep raised equipment and moving loads within the confirmed operating envelope for the site.
Standard package or custom request?
Standard winch doors and zipper man doors are part of the basic package. Product pages show the current kit price and supplied specification. Custom doors, frame changes and end-wall changes need a separate confirmed scope. A nominal 20′ × 20′ maximum is a design limit, not an included upgrade.
Before ordering, give MAX your equipment measurements, building size, delivery location, approach conditions and preferred door position. We can then confirm the right configuration and tell you what changes the price.
Door questions
What is the largest MAX winch roll-up door?
The maximum is 20 feet wide by 20 feet high, and only where the selected truss profile allows that opening. It is not the standard door size on every building.
Does the whole end wall roll up?
No. The winch door is a defined opening within the end wall. Building width and peak height are not door dimensions.
Can I request a wider sliding door?
Sliding doors can be configured for different openings. Give MAX your required clear width and height so the supplier can confirm frame fit, drawings and pricing.
How do I know whether my equipment fits?
Measure its maximum transport width and height, including attachments and roof equipment. Compare those measurements with the usable door opening and approach, then check interior clearance where it will be parked or operated.
Will a road-legal truck or RV automatically fit?
No. Road dimensions and building peak height do not establish door clearance. Check the supplied opening, approach slope and actual vehicle dimensions.
Can I change the door after installation?
Ask MAX to review the frame, end-wall layout and components before modifying an opening. Do not assume a larger door can be fitted to an existing truss.
Are walk-through doors included?
The standard package includes zipper man doors alongside the supplied winch doors. Your selected model and written quote confirm the supplied layout.
What should I enter in MAX Express?
Keep the standard doors to use the published package price, or select Request a custom door size on the summary. A custom opening goes to fit and price review before payment.
Choose your building and door options
Sources and editorial information
Door limits follow MAX’s confirmed product instructions. Opening references use the manufacturer elevations in the maintained product catalogue. Equipment examples are illustrative; measure the actual equipment. See the editorial policy.