- Federal rules set the standard maximum width on the National Network at 102 inches, or 8.5 feet.
- States may issue special permits for wider loads, which is how a 10 ft cube travels.
- Freight, permits and any escorts are quoted for your route and are separate from the bunker price.
Why 10 feet
A wider cube means fewer joints and more room inside for the same number of pieces. Ten feet outside gives about 9 ft 4 in square inside, room for a bunk on each wall with a walkway between, while staying a load that states permit routinely.
The width rule
Federal regulation 23 CFR 658.15 says states may not set a width limit of more or less than 102 inches for trucks on the National Network of highways. The same section lets states grant special use permits for vehicles wider than that. A 10 ft load is 120 inches, so each cube moves under a state oversize permit for each state on the route.
Signs, flags, escorts and timing
Each state writes its own conditions for permitted loads: the hours a load may travel, banners and flags, and the width or route at which an escort vehicle is required. Some states do not allow oversize moves on weekends, holidays or at night. Your freight quote is built for the actual route to your site, and a cube may take an extra day in transit because of those windows.
At your site
The truck needs a firm road to the excavation and room to park beside the crane. Soft ground, tight turns, low wires and steep grades all matter. The site visit checks the route from the county road to the hole.
Questions
Does a CUBE Bunker need an escort?
It depends on the state and the route. Many states require only permits, banners and flags at 10 feet; some require escorts on certain roads. Your freight quote spells it out.
Who pays for permits and freight?
They are quoted separately from the bunker and invoiced before shipping. A dealer quotes them for your site outside Utah.
CUBE Bunker prices are preliminary until engineering for the cube system is complete and are confirmed in writing after a site visit. This guide is general information, not engineering, legal or medical advice. Updated 2026-11-02.