A long list of mine that are essential (to me, that is), and are deal breakers if not present:
1: E-450 chassis, V-10 engine.
2: Rear view camera.
3: Auto-level jacks.
4: Azdel or aluminum sides.
5: Fiberglass or one piece metal roof, both crowned and folded around the top by a few inches.
6: The chassis having a remote for the door locks, and the keypad.
7: A 300 watt inverter, PSW. This would allow me to charge low-energy stuff like cellphones and tablets overnight.
8: A water heater bypass for winterizing.
9: Solar pre-wired.
10: A 5000 pound tow hitch.
11: Multi-stage converter, so I can keep the rig plugged in when at home.
12: An inbuilt generator that uses the fuel tank on the chassis.
13: An EMS, so low voltage won't burn out the A/C compressor, or plugging into 240 will give a display error code, and not a fried rig.
14: Fantastic Fan, 12 volt, with thermostat, ability to run forward/reverse, and rain sensor.
15: Tank heating pads and pipes wrapped with heating tape.
Not essential, but nice to have:
1: An electric awning.
2: Quigley 4x4 conversion.
3: Macerator pump with emergy outlet and gray water dump. I saw one used motorhome that actually had both a macerator pump and a regular gravity dump for emergencies. That way, you always have a way to empty the tanks out.
4: Full solar system, MPPT charger, with panels on top.
5: 300 amp-hours of battery life.
6: A full-time, "hybrid" PSW inverter. This way, no matter what the power is on the charging side, all appliances either get 120VAC or 0 VAC.
7: An audio head with Bluetooth hands free calling and playing music for when driving.
8: Full size spare tire.
9: Roof ladder.
10: Generator management system, so if the batteries get low, the genset fires up... assuming no quiet hours set.
11: A Cheap Heat system so if on hookups, no propane would be needed.
12: A water heater with both electric and propane.
13: A convection microwave/oven.
14: An accumulator tank so the water pump is quieter.
15: Mounts on the roof for RotoPax gasoline containers.
Pie in the sky wants:
1: A rear hitch that can tow more than 5000 pounds.
2: A 5500 watt generator, and 50 amp service (in reality, one leg for one A/C, the other for the second A/C and everything else.)
3: 1200 ampere-hours in the battery bank, so a residential fridge can be used when boondocking.
4: A hydronic system with a radiator in each storage compartment and near the tanks.
5: A Platinum Cat system, so I can minimize the use of the normal furnace when boondocking.
6: Fold-out solar panels on the sides.
7: A flexible solar panel on the awning as well.
8: A propane fuel cell like the Truma VeGA model. That would mean no worry about keeping batteries topped off, and would mean an efficient compressor refrigerator can be used while boondocking.
9: A clean-out, watertight hatch to all three tanks, 8-12 inches in diameter. This way, if there is a poop pyramid, it can be dealt with by a plastic scraper and a wet/dry vac, and clogs are easy to deal with.
