USGS, footnoted to the National Geodetic Survey. The state survey measures the monument itself at 447.85 ft and the ground just west of the road at around 450
Delaware Climate Office. Mean annual temperature runs from 54.0°F in northern New Castle County to 58.1°F on the Atlantic coast
Service for a rig used here
Know the rig’s exact length and what it is classed as, because Delaware’s two camping systems treat it differently. State park campsites take one mobile camping unit and one tent, with one vehicle per site and overflow parking elsewhere. State forest sites take none: pickup campers, travel trailers and motor homes are excluded from them outright.
The coastal environment does the rest of the work on a rig. Seals, roof penetrations, underbody coatings and anything that holds fresh water need attention in a state that averages about 45 inches of rain and sits in the path of nor’easters and autumn tropical systems.
A camper van, truck camper or expedition vehicle has two sets of systems, and most mechanics only want one of them. RV and van service centers work on the living side: the 12-volt system, heat, water, ventilation and everything that leaks or rattles loose after a season of dirt roads.
Typical work
01House battery, charging, solar and inverter diagnosis
02Diesel and propane heaters, and water heaters
03Plumbing, pumps, tanks and winterizing
04Roof fans, air conditioning, windows and seals
05Appliance service and leak repair
How to choose a service center
These systems are brand-specific, and so is the training.
01Ask which brands of heater, battery and inverter they are trained on.
02Ask if they will work on owner-built or small-builder vans. Some will not touch wiring they did not install.
03Ask about turnaround in season. Service backs up in spring and summer.
04Bring documentation: a wiring diagram, a component list and photos from the build.
What to have ready before you ask for a quote
Model numbers save a phone call.
01The vehicle or camper, and who built it
02The components: battery type and size, inverter, heater model
03What it is doing, and when
04Photos of the installation
05Where and when you can drop it off
Questions people ask
My heater stopped working at altitude. Is it broken?
Maybe not. Fuel-burning heaters can struggle at high elevation and may need an altitude setting or kit, and they soot up if they only ever run on low. A service center that knows the brand can check it and set it up for where you camp.
Can a shop add solar or lithium to an existing system?
Usually, but lithium batteries need compatible charging from the alternator, solar and shore power. A shop should look at the whole system rather than swap the battery and hope.
How do I winterize a van?
Drain or protect anything that holds water: tanks, pump, lines, water heater and filters. How you do that depends on how the system was built, so ask the builder or a service center to show you once.
How high is Delaware?
From Rehoboth Beach at 1 feet to Ebright Road, at the Pennsylvania line at 448.
Altitude decides what your engine, your brakes and your lungs have to work with, and how late in the year the passes open.
0
Feet above sea level
Towns
WilmingtonThe Brandywine Valley byway, and thirteen Underground Railroad sites on the Tubman route91 ft
HarringtonTaber State Forest country, and the inland pond parks59 ft
GeorgetownThe county seat below Redden State Forest53 ft
SmyrnaThe turn for Bombay Hook and for Blackbird State Forest32 ft
DoverThe capital, and the John Dickinson Plantation out on the bayshore road28 ft
LaurelNanticoke byway country and the southern end of the Woodland Ferry run27 ft
MillsboroInland services on the Indian River, west of the inlet24 ft
SeafordThe Nanticoke River crossing and the northern ferry approach23 ft
MilfordMid-state services between the bayshore refuges and the coast13 ft
LewesThe ferry landing, Cape Henlopen and the Beach Plum Island crossing13 ft
MiltonThe approach to Prime Hook and the bayshore marshes11 ft
New CastleThe northern end of the Delaware Bayshore Byway10 ft
Bethany BeachThe break in the state park between Delaware Seashore and Fenwick Island6 ft
Fenwick IslandThe southernmost drive-on beaches and the Maryland line5 ft
Dewey BeachThe northern end of the Delaware Seashore barrier strip5 ft
Rehoboth BeachFull services between Gordons Pond and the Delaware Seashore beaches1 ft
Passes, high roads and summits
Ebright Road, at the Pennsylvania lineThe state high point, in New Castle County. USGS publishes 448 feet, footnoted to the National Geodetic Survey; the Delaware Geological Survey measures the benchmark at 447.85 and the ground just west of the road at around 450448 ft
Iron HillOur own reading of the elevation surface at its map point, in New Castle County335 ft
Chestnut HillOur own reading of the elevation surface at its map point, in the piedmont of New Castle County297 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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