Four-wheel drive is always required beyond mile 5. The seashore protects about 66 miles of coast
What Texas asks of a build
Build for two jobs that share almost nothing. West of the Pecos the work is desert self-rescue: the Park Service wants at least 8 inches of clearance, 15-inch rims and a low-range transfer case before it calls a vehicle capable, and the state asks for two inflated spares on the unmaintained roads of Big Bend Ranch. On the coast it is salt, soft sand and airing down and back up.
Tell a builder which Texas you are building for. A rig set up for 51 miles of River Road is a poor fit for 60 miles of beach, and neither wants to be 24 feet long.
A builder plans and installs the whole system rather than one part of it: suspension matched to the finished weight, protection where the vehicle actually touches the ground, electrical power sized to what you run, and storage, water, sleeping and recovery points that work together. The good ones start with how you travel and work backward to parts.
The work that matters most is the work you cannot see. Wiring that is fused, labeled and documented. Fasteners that stay tight on washboard. A finished weight that stays inside what the vehicle is rated to carry.
Most full builds cover
01Suspension and tires chosen for the loaded weight
02Bumpers, sliders, skid plates and rated recovery points
03House battery, charging, solar and lighting
04Storage, drawers, fridge and water
05Sleeping: a roof tent, a camper or an interior platform
06Mounts for communications and navigation
How to choose a builder
Any shop can show you a finished truck in good light. These questions tell you how it was built.
01Ask to see finished builds on your platform, and talk to an owner who has put miles on one if you can.
02Ask what the vehicle will weigh when it is done and how that compares to its gross vehicle weight rating. A builder who cannot answer has not done the math.
03Ask who does the electrical work and whether you get a wiring diagram at handover.
04Ask what is done in house and what is sent out.
05Get the scope, the parts list, the price and the payment schedule in writing before work starts, and ask how changes are handled.
06Ask what warranty covers their labor, separate from the manufacturers' warranties on parts.
What to have ready before you ask for a quote
A builder can only quote what you can describe. The form on this page asks for exactly these things, which is why a quote that comes back from it is worth something.
01Year, model, engine and drivetrain, and for vans the wheelbase and roof height
02What has already been done to it
03How you travel: weekends or months, how many people, which climates, how far from pavement
04What you need to carry: water, fuel, bikes, boats, tools
05A budget range and a date you would like it back
Questions people ask
How much does an overland build cost?
It depends on scope more than on the vehicle. Suspension, tires and a roof tent is a different project from a full electrical system with cabinetry and armor, and labor is usually the largest part of a full build. The only number worth planning around is a written quote against a defined scope, which is what the form on this page is for.
How long does a build take?
Bolt-on work can be days. Full builds take longer, and at busy shops the wait for a start date can be longer than the work itself. Ask every shop for both numbers: when they can start and how long they need the vehicle.
Should I build in stages or all at once?
Stages work if the order is right. Decide the finished load first, because springs chosen for an empty truck will be wrong for a full one. Run electrical before interiors go in, because pulling cabinets to add a wire is paying for the same work twice.
Will modifications affect my warranty or insurance?
They can. Ask the builder which work they have seen raise warranty questions on your platform, read your warranty terms, and tell your insurer what has been added so the build is covered for its real value.
How high is Texas?
From Port Aransas at 6 feet to Guadalupe Peak at 8,749.
Altitude decides what your engine, your brakes and your lungs have to work with, and how late in the year the passes open.
02,0004,0006,0008,00010,000
Feet above sea level
Towns
Fort DavisIn the Davis Mountains at the start and finish of the 75-mile loop drive Texas Parks and Wildlife describes through the range.4,896 ft
AlpineOn US 90 with the Amtrak and bus stops, 100 miles from Big Bend park headquarters. State Highway 118 runs south from here to Study Butte.4,477 ft
MarathonOn US 90 at the top of US 385, 70 miles north of Big Bend park headquarters. FM 2627 leaves here for Black Gap, 55 miles south.4,044 ft
Van HornOn I-10 where State Highway 54 runs north toward Guadalupe Mountains National Park. Last interstate services before that corner of the state.4,044 ft
El PasoFar west corner, where I-10 meets the border. Franklin Mountains State Park sits inside the city, and the Trans-Mountain Highway crosses it.3,713 ft
AmarilloWhere I-40 and I-27 meet in the Panhandle. Lake Meredith and its two off-road areas are north, Palo Duro and Caprock Canyons south and southeast.3,670 ft
CanyonAt the gate of Palo Duro Canyon State Park on Park Road 5, where the Civilian Conservation Corps road drops to the canyon floor.3,543 ft
Fort StocktonWhere I-10 meets US 285 and US 385. The nearest EV charging to Big Bend, 130 miles out, and one of three towns with major shopping near the park.2,973 ft
TerlinguaStudy Butte and Terlingua sit between Big Bend’s west entrance and the Barton Warnock Visitor Center at the east end of Big Bend Ranch. Fuel and diesel.2,890 ft
PresidioWest end of FM 170 and the Fort Leaton entrance to Big Bend Ranch. Fuel, and the only local extraction and mechanic service for the ranch.2,581 ft
QuitaqueAt Caprock Canyons State Park and the Trailway, 100 miles southeast of Amarillo in Briscoe County.2,577 ft
Del RioOn US 90 at Amistad National Recreation Area, and the nearest full-service town to the Devils River State Natural Area.965 ft
HuntsvilleOn I-45 at the Sam Houston National Forest, 50 miles north of Houston, beside the only OHV trail in the national forests of Texas.371 ft
LufkinHeadquarters of the National Forests and Grasslands in Texas, and the service town between the Angelina, Sabine and Davy Crockett forests.313 ft
Corpus ChristiThe mainland base for Padre Island National Seashore. Last full services before the causeway and the 60 miles of drivable beach.7 ft
Port AransasOn Mustang Island, where the city sells the beach parking permit for markers 0 to 62 and allows camping on the sand.6 ft
Passes, high roads and summits
Guadalupe PeakThe highest point in Texas, in Culberson County. No road reaches it8,749 ft
Mount LivermoreHigh point of the Davis Mountains, inside the 75-mile loop out of Fort Davis8,338 ft
El CapitanThe cliff at the south end of the Guadalupe escarpment, above the Williams Ranch road8,095 ft
Emory PeakThe high point of the Chisos Mountains, in Big Bend National Park7,818 ft
Panther PassThe saddle the Chisos Basin Road crosses on its 6 paved miles into the basin5,778 ft
Trans-Mountain Highway summitTrans-Mountain Highway, Franklin Mountains State Park5,120 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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