Some years over 200 inches, with snow on the ground from late November through late April
Building a van for Great Lakes weather
Start with the heater and the water system. Snow lies on the ground in the Upper Peninsula from late November through late April, and Pictured Rocks alone reports more than 15 feet of snowfall in a season. A van meant for year-round use here needs a heating and plumbing plan that survives a long cold spell parked, not just a cold night.
Then think about the bridge. The Mackinac Bridge treats a van as a high-profile vehicle: 20 mph in a high wind advisory, mandatory escort from 35 to 50 mph of sustained wind, and closed to high-profile vehicles above 50. Plan the roof rack and the awning knowing the crossing can be refused.
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 Michigan?
From Oscoda at 588 feet to Mount Arvon at 1,979.
Altitude decides what your engine, your brakes and your lungs have to work with, and how late in the year the passes open.
02,000
Feet above sea level
Towns
WatersmeetWhere US 2 meets US 45 in the middle of the Ottawa National Forest. Nearest town to the Sylvania Wilderness and the forest’s highest ground.1,598 ft
IronwoodFar western corner on US 2, at the edge of the Ottawa National Forest. The Ottawa calls it the largest city on the forest boundary, at about 9,000 people. The Black River byway leaves from Bessemer just east.1,503 ft
CadillacSupervisor’s office town for the Huron-Manistee National Forests. The USGS puts the geographic center of Michigan in Wexford County, 5 miles north-northwest of here.1,308 ft
GraylingOn I-75 at the Au Sable River, with state forest road country in every direction and the Huron National Forest to the east.1,135 ft
BaldwinMiddle of the Manistee National Forest, on the Pere Marquette. Sections of the Michigan Cross Country Cycle Trail and the forest’s motorcycle trails run either side of town.837 ft
MarquetteThe largest city in the Upper Peninsula and its main stop for parts, tires and a hospital. Commercial flights serve it, and Munising is about 43 miles east.664 ft
HoughtonKeweenaw Peninsula service town on US 41, and the mainland headquarters for Isle Royale. The Ranger III sails from here and your vehicle stays behind.634 ft
Grand MaraisEast end of County Road H-58 and the Grand Sable Visitor Center. The road east of Adams Trail is not plowed in winter, so this end goes quiet.628 ft
Copper HarborNorth end of US 41 and of the Copper Country Trail byway, 52 miles from Houghton by the Park Service’s reckoning. The other Isle Royale ferry leaves from here.615 ft
Sault Ste. MarieBorder city at the east end of the Upper Peninsula and the start of the Whitefish Bay byway south on the Mackinac Trail, H-63.613 ft
OntonagonOn Lake Superior about 20 miles east of Porcupine Mountains Wilderness State Park, per the DNR. Last real services before the park’s campgrounds and the South Boundary Road.613 ft
MunisingWest gateway to Pictured Rocks and the Hiawatha’s Munising Ranger District. The Grand Island ferry leaves from M-28 about 2.5 miles west of town.607 ft
ManistiqueOn US 2 on the Lake Michigan shore, in the Hiawatha’s Rapid River and Manistique district. Forest Road access to the single rustic lake campsites runs north on M-94.600 ft
Traverse CityLargest town in the northwest Lower Peninsula, on the M-22 byway and about an hour from Sleeping Bear Dunes. Full services before the smaller lakeshore towns.596 ft
St. IgnaceNorth end of the Mackinac Bridge, where I-75, US 2 and M-134 meet. The place to wait out a wind closure rather than sit on the approach.590 ft
OscodaLake Huron end of the River Road National Scenic Byway, where the Au Sable reaches the lake. Eastern gateway to the Huron National Forest.588 ft
Passes, high roads and summits
Mount ArvonThe highest point in Michigan, in Baraga County. Our own reading of the USGS elevation surface at the summit is 1,978 feet1,979 ft
Mount CurwoodA few miles from Arvon and within two feet of it on our reading. The USGS names Arvon as the state high point1,977 ft
Summit PeakHigh ground of Porcupine Mountains Wilderness State Park. Our own reading, because no state page publishes an elevation for it1,956 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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