Here's an excerpt from my invoice for the standard part of the conversion:
1, 2007 ( build date, 4-07 ), E350 extended cargo van, Sportsmobile
class B motorhome, 6.0 diesel, 5R110 automatic transmission. 4.10 gear ratio rear axle VIN, xxxx STANDARD CONVERSION TO INCLUDE FOLLOWING 2008 F350 PARTS, 6,000 lb. Dana 60 Super mono-beam front axle with 7,000 lb. disc brakes ( requires minimum 17 inch 8 on 170 MM wheels to fit over rotors ), manual hub locks, drag link, tie rods ( converted van turns tighter than a stock van ), coil front suspension with bolt on frame mounts, 2 speed NV271 "shift on the fly " transfercase, manual floor mounted shifter ( not in way of rotating drivers seat ), 4 wheel ABS.
STANDARD CONVERSION TO INCLUDE FOLLOWING NEW NON FORD PARTS,
3.5 inch lift, steel transfercase skid plate, L.E.D. dash mounted 4x4 light, 1.375 inch dia. Roadmaster chrome-moly front sway bar, 1.500 inch dia. Roadmaster chrome-moly rear sway bar, set poly sway bar mounts, set Rancho RSX99900 adjustable shock absorbers, steel rear axle lift blocks, Tri-8 rear u-bolts, air filters on front axle, rear axle and transfercase air vents, Salem Kroger HD track bar with replaceable poly end bushings, pair rear axle billet adaptors, set 5, BFG LT245/75R17E tires mounted on 5, black steel 17 X 8 wheels.
PRICE FOR ABOVE CONVERSION,
Then as far as options go, with S&K your imagination and budget seem to be the limits.