19 Forest Service, 4 Park Service, 4 Corps of Engineers and 1 BLM; 23 can be booked ahead
Building a van for the plains and the Hills
A tall van rules itself out of some of the best pavement in the state. The Needles Eye Tunnel is 8 feet 0 inches wide by 9 feet 9 inches high, the Iron Creek Tunnel 8 feet 9 inches by 10 feet 10 inches, and the lowest tunnel on Iron Mountain Road is 10 feet 9 inches high. Know your loaded height before you plan a loop. Then build for winter: the state can close any highway in bad weather, plows run 5 a.m. to 7 p.m., and salt stops working below 15 degrees.
A conversion is a small house on a moving, flexing, weight-limited platform. The builder insulates and lines the shell, installs the electrical system, plumbing, heat and ventilation, builds the bed, galley and storage, and cuts the holes for windows, fans and vents that you do not want to get wrong.
Some shops build complete vans to a set floor plan. Others build to order, and a few will take on partial work such as electrical only.
A typical conversion includes
01Insulation, wall and ceiling panels, and flooring
02House battery, alternator charging, solar, inverter and shore power
03Roof fan, heater, and sometimes air conditioning
04Fresh and gray water, a sink, and sometimes a shower and water heater
05Bed, galley, seating and storage
06Windows, racks, ladders, awnings and exterior lighting
How to choose a van builder
Floor plans are easy to fall for. The questions underneath them matter more.
01Decide between a shop's standard layout and a custom build. Standard layouts are faster, and the shop has already solved their problems.
02Ask what the finished van weighs with water and gear. Sprinters are sold in several gross weight ratings, and a heavy build on the lightest chassis leaves little margin.
03Ask how the electrical system is protected and documented, and whether the components can be serviced on the road.
04Ask how cabinetry is fastened to the van. Furniture that is only screwed to thin wall panels works loose on rough roads.
05Ask how added seats and seat belts are engineered and anchored if anyone rides behind the front row.
06Get the scope, price, payment schedule and delivery date in writing.
What to have ready before you ask for a quote
The van you order decides what can be built in it, so it helps to talk to a builder before you buy.
01Model year, 144 or 170 wheelbase, roof height, and two-wheel, all-wheel or four-wheel drive
02How many people sleep in it and how many ride in it
03The seasons and climates you travel in
04Whether you need to work from it
05What goes inside with you: bikes, boards, dogs
06A budget range and the date you want to be traveling
Questions people ask
Do I need to own the van before I contact a builder?
No. Many builders would rather talk first, because the wheelbase, roof height and drivetrain you order decide what can be built. Some shops can also source a van.
How long does a Sprinter conversion take?
A full custom build is usually measured in months, plus whatever wait the shop has before it can start. Standard layouts are quicker. Ask for both numbers.
Should I get the 144 or the 170 wheelbase?
The 144 is easier to park, turn and drive on tight roads. The 170 gives you room for a fixed bed and a real galley without compromise. Think about where you will actually drive it, then about how you want to live in it.
Can these builders work on a Ford Transit or Ram ProMaster?
Many do. If you are on another platform, say so in the form and we will look for shops with that experience.
How high is South Dakota?
From Chamberlain at 1,407 feet to Black Elk Peak at 7,242.
Altitude decides what your engine, your brakes and your lungs have to work with, and how late in the year the passes open.
02,0004,0006,0008,000
Feet above sea level
Towns
CusterSupervisor’s office for the Black Hills National Forest, on US 385 with Custer State Park immediately east.5,313 ft
LeadThe highest town on this list, in the northern Hills directly below Terry Peak.5,209 ft
Hill CityOn US 385 in the central Hills, between the two loops of the Peter Norbeck Scenic Byway.4,985 ft
DeadwoodNorthern Black Hills town a few miles down the gulch from Lead, and a base for the forest roads under Custer Peak.4,536 ft
KeystoneAt the foot of Mount Rushmore, where Iron Mountain Road climbs south toward Custer State Park.4,336 ft
SpearfishNorth end of the Spearfish Canyon Scenic Byway, at the I-90 corner of the Black Hills.3,642 ft
Hot SpringsSouth end of the Hills on US 385. Fall River Ranger District office for Buffalo Gap National Grassland, with Wind Cave just north.3,447 ft
SturgisOn I-90 at the northeast edge of the Hills. The BLM’s Fort Meade Back Country Byway runs just south, and Bear Butte stands northeast.3,427 ft
Rapid CityThe hub for everything west river. Interstate 90 meets US 16 and SD 79 here, with the Black Hills west and the Badlands about an hour east.3,243 ft
Belle FourcheHome of the BLM South Dakota Field Office, which manages the state’s public land from here at the northern edge of the Black Hills.3,021 ft
BuffaloLast town of any size in the far northwest corner. The Forest Service works this country from a Sioux Ranger District office at Camp Crook, west of here.2,876 ft
WallI-90 Exit 110 at the north gate of Badlands National Park. Wall Ranger District office and the National Grasslands Visitor Center are on Main Street.2,827 ft
InteriorThe small town on the southeast side of the Badlands North Unit, and the lowest place on this list west of the Missouri.2,382 ft
PierreState capital on the Missouri River. Fort Pierre National Grassland starts about 24 miles south on US 83, and Oahe Dam is five miles north of Fort Pierre.1,479 ft
Sioux FallsLargest city in the state and the eastern gateway, where I-90 meets I-29.1,473 ft
ChamberlainWhere I-90 crosses the Missouri River, roughly the midpoint of a long day between Sioux Falls and Rapid City.1,407 ft
Passes, high roads and summits
Black Elk PeakThe highest point in South Dakota, inside the Black Elk Wilderness. No road to the top7,242 ft
Crooks TowerLimestone plateau country southwest of Lead, south of the head of Spearfish Canyon7,116 ft
Terry PeakThe landmark summit directly above Lead, in the northern Black Hills7,066 ft
Custer PeakNorth-central Black Hills, south of Deadwood6,808 ft
Spearfish Canyon, Cheyenne Crossing endSpearfish Canyon Scenic Byway: Spearfish and Cheyenne Crossing on US 14A5,300 ft
Bear ButteStanding alone on the prairie northeast of Sturgis, and a state park4,423 ft
Pass, road and summit elevations are the figures published by the agency that manages them. Town elevations are the town’s or county’s own
figure where it publishes an exact one; the rest are from the U.S. Geological Survey (3D Elevation Program at the place’s official coordinates),
retrieved September 18, 2026. Every source is listed at the foot of the page.
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