The Trailer Owner's
Complete Field Guide
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M1

Monthly & Annual Maintenance

The maintenance calendar that keeps expensive failures from happening. Per-trip checks, monthly tasks, and the annual schedule that most owners skip — until something breaks.

⏱ Monthly: 30–45 min | Annual: half day
Want a printable version? Open in the RV Field Guide app — it includes a black & white print mode optimized for paper.

A trailer has no dashboard warning lights, no odometer-linked service reminders, and no computer monitoring its condition. Everything that goes wrong starts as a slow, preventable failure — and the only early-warning system is you doing this checklist.

Section 1 — Every Month (Between Trips)

  • Battery charge check12.5V+ on lead-acid at rest; 13.0V+ on LiFePO4; charge if below
  • Slide seal conditionrun a finger along each seal perimeter; should feel pliable, not brittle
  • Apply slide seal conditioner if seals show any stiffness3-ONE CareBuy ↗
  • Awning fabricinspect for mold, tears, or fraying at the edges; clean with mild soap if any black spotting appears
  • All roof ventsopen and close each one; lubricate hinge with dry silicone spray if stiff
  • Sewer hoseinspect for cracks, pinholes, or sun-damaged sections; a cracked hose is a biohazard; replace before it fails
  • Water pressure regulatorno visible cracks in the body; gauge reads in normal range when connected
  • Exterior caulk and sealanta 5-minute visual scan for any new gaps or cracks forming; address immediately with Dicor 501LSWBuy ↗
  • Rodent evidence checkunder the trailer, in exterior bays, in the underbelly fabric; look for droppings or chewed material

Section 2 — Every 6 Months (Start and End of Season)

  • Fresh water system sanitationrun the full Water Sanitation procedure (List 10); even mid-season if you've had any off taste or smell
  • Roof walk-and-inspecton the roof, hands and feet; check every seam, vent, skylight base, AC unit base, and antenna mount
  • Apply lap sealant to any cracked seamDicor 501LSW; even hairline cracksBuy ↗
  • Apply rubber roof conditionerEPDM or TPO appropriate product; roof conditionerBuy ↗
  • Slide-out full operation testextend each slide fully, inspect track for debris, gear teeth for wear, seals for tearing
  • All exterior light bulbsreplace any dim or flickering; trailer light sockets corrode faster than tow vehicle sockets
  • Electric brake inspectionwith brake controller activated, feel each wheel while trailer brakes apply; all four (or two on single-axle) should have resistance; no resistance = failed magnet; brake magnet replacement
  • Propane regulator testlight each stove burner; clean blue flame = healthy regulator; yellow or orange = service
  • Freshwater filter cartridge replacementCamco TastePURE KDF; don't wait for taste to change

Section 3 — Annually (Spring Startup)

The annual tasks are the expensive ones to skip. A blown wheel bearing costs $3,000+ roadside. A delaminated wall costs $5,000+. A cracked roof leak costs $8,000+. The annual checklist is prevention, not maintenance.

  • Wheel bearing inspection and repackthe most critical annual trailer task; annual or every 10,000–12,000 miles, whichever comes first; have this done by a qualified RV or trailer service shop — it requires the right tools, correct bearing grease, and proper torque specs; do not skip
  • Brake drum and shoe inspectionremove drums; inspect shoe thickness (replace if under 3/16"), check drums for scoring; check magnet resistance (7–8 ohms is spec for most Dexter/Hayes setups); brake inspection
  • Anode rod replacement (Suburban water heaters only)inspect each spring, replace if 50% consumed or steel core wire exposed; Suburban anode rod
  • Full roof walksame as 6-month inspection, but also check for any winter storm damage, soft spots under foot, or impact damage
  • Slide-out lubricationdry lube (silicone spray only, not grease) on tracks and visible gear teeth; Super Lube silicone spray
  • Awning mechanismcheck spring tension, end caps, mounting hardware; apply dry lube to the arm pivots
  • All safety device replacementsCO + LP combo detector every 5–7 years regardless of function; smoke detector battery every year (or 10-year sealed unit)
  • All tire age checkcheck DOT date codes on every tire; 5–6 years is the replacement threshold for trailer tires regardless of tread; tire pressure gauge for current pressure verificationBuy ↗
  • Hitch componentsinspect ball mount, coupler latch pivot, safety chain loops, and breakaway cable for wear, rust-through, or cracks
  • Wiring harness and 7-pin connectorinspect full trailer wiring run for any rubs, chafe points, or rodent damage; replace 7-pin pigtail if corroded

Section 4 — If You Go More Than 30 Days Without Using the Trailer

These are not full inspection items — they're the minimum checks required before returning to service after a storage gap. Storage degrades things faster than use does.

  • Battery charge checklead-acid self-discharges 3–5% per month; connect a smart maintainer for storage longer than 2 weeks
  • Tire pressure checktires lose 1–2 PSI per month; reinflate to cold spec before any trip
  • Open the trailerair it out; run AC or fans for 20 minutes; run all faucets briefly; inspect for rodents
  • Pre-cool the fridgeabsorption fridge needs 24 hours to pre-cool before a trip; don't assume it's ready on departure morning
  • Quick external visuallook for any storm damage, animal damage, or new caulk cracks that appeared during storage
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