Buying guide

Buy the gear that fixes a Saturday, in this order

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RV catalogs are a pile of things you might use once. The gear that earns a spot in the bay is the gear you touch at every site: getting level, getting in the door, getting the tanks empty, and keeping air moving. Buy in that order. A flag mount and a camp chair can wait until the hose has a home.

1. Know the angle, then lift the low side

Two purchases, not one. A bubble, a phone, or a Bluetooth sensor tells you how far off the floor is. Blocks or a curved leveler change it. The HUNKING level is a sensor. Its listing calls itself an auto-leveling system. Nothing in that listing lifts the rig. Treat it as a remote pitch-and-roll reading, mount it square to the floor, and keep a real leveler in the compartment.

For the lift, run the leveling calculator before you buy a 4-pack and discover you needed ten. Side-to-side uses the track, tire center to tire center. Front-to-back on a trailer uses the tongue jack to the axle. Camco's interlocking blocks add about an inch each and also pad a jack. Andersen's curved leveler, in the 3604 listing, does half-inch steps up to 4 inches and only under a tire. One leveler is one tire, so a tandem low side wants a pair. Past 4 inches, move the RV. Stacking higher is how a tire walks off. Campground choice matters here too: RV Camp Atlas is the planning side of where you park, and the national park campground finder shows which parks even have a pad long enough for the rig.

2. Match a step to the threshold, not to a photo

Measure from the ground to the threshold on level pavement. Do it hitched and unhitched if you tow. Put the number in the step calculator. The default counts a final step from the top tread into the doorway, which is how a freestanding stair works. A "3-step" product is three treads. A 4-step stair under a low door is not a safer stair.

If the step should fold into the door and travel with you, that is a Lippert Solid Step, and the width has to match the door frame. The 30-inch 678027 listing is for doors about 35 to 44 inches off the ground. If you will not drill the RV, OUTPRIZE's stair is the portable pick: a rail that can swap sides, and stakes in the description. DNYKER is the one that prints a 25.6 by 8.9 inch tread and sells a 4-step with two rails. Both are also marketed as hot-tub stairs. That is fine. It means they sit on the ground, and they will wobble if the feet are not planted.

3. A hose kit, slack, a support, then a tube

Buy the hose and the support together. A wire-reinforced hose holds a bend, including the bend that sags into a puddle. The length calculator uses the path you will actually run, adds slack so the bayonet is not a lever, and checks a quarter inch of drop per foot. A 20-foot kit is two 10-foot sections. It is enough for a lot of sites and not enough for every park dump.

Camco's RhinoFLEX kit is the first hose we would hand someone, because the listing includes a clear elbow and a 4-in-1 dump adapter. Valterra's Dominator is the same shape of kit if a bulky fitting will not fit your bay. The Sidewinder support is the piece that keeps either hose honest. Store the hose in a tube, and believe the tube listings when they say the elbow does not fit. Lyrivan's aluminum tube is the storage pick: hinged cap, 4.7-inch inside diameter, 54 to 95 inches. OUTPRIZE's PVC tube is the lockable alternative, and it says the elbow stays out.

4. Air before glass

A dead roof vent and a bright skylight are different holes. A Maxxair MaxxFan replaces a standard 14-by-14 roof vent and, per the listing, can run behind a rain cover. A WKZO cover replaces a 4.5-inch ceiling AC register and spreads air in a circle. It does not fully close, which is how you avoid icing the air conditioner by shutting every vent. A QIPECO grille is a 2-by-10 floor furnace vent. None of these fit each other's holes.

Condensation on the glass is usually moisture from people, cooking, and propane heat, not a window that needs replacing. Vent it. A Lyrivan shade is the no-cut answer for sun and privacy on a door window near 12 by 21 inches. The cover itself is 16 by 25. Replacement OUTPRIZE glass is for a cracked pane or a rotten frame, and only after you match wall thickness. Their families do not share one wall number. The horizontal slider we read is for about 1/8 inch. The frameless 14-by-22 is for 1.5 or 1.875 inches. The breathable window we read is for 2 inches. Measure the rough opening and the wall, then pick the family. If you have not cut an RV wall, don't start with a 40-inch hole.

5. The accessories that are allowed to wait

A bunk ladder is worth buying when the factory one walks off the rail. Measure floor to rail at the angle you want, and use a length OUTPRIZE actually lists: 52, 57, 62, 67, or 72 inches. The 52-inch listings say 300 pounds, 12.8 inches wide, and hardware for a hook or a screw mount. Duplicate ASINs at the same length are the same title. Buy one.

A tote carrier belongs on a square bumper no bigger than 4.5 inches, and it belongs under an empty tank. A full 36-gallon tote is a few hundred pounds. The carrier does not upgrade a decorative bumper into a truck bed. A flag mount is a clamp for 2-inch and 2.25-inch tongue jacks and poles up to 1 inch. Measure the jack tube. A camp chair is a camp chair.

When something fails on a trip, the field notes cover the usual nights: a rig that will not level, a bayonet that drips, a step that rocks, a fan that will not spin, a window that sweats, a tank sensor stuck on full. They publish on a schedule. The tools on this page do not wait.