RV Repair & Service for St. Charles, MO

St. Charles is one of the fastest-growing communities in the St. Louis metro — and it's RV country. Sundermeier RV Park, one of the top-rated campgrounds in Missouri, is right here in town. The Katy Trail runs through the area. And St. Charles County has some of the highest household incomes in the state, which means a lot of nice rigs that need quality service.

3R RV Service Center is just 40 minutes west of St. Charles on I-70 to Highway 47 in Union, MO. That makes us closer than most of the St. Louis metro shops — and without the traffic headache of hauling your rig through the city.

We're family-owned, RVTI Level 4 Master Certified, and factory authorized for Newmar, Tiffin, and Keystone. We've been serving St. Charles County RV owners since 2005.

Sundermeier & Katy Trail RVers

If you camp at Sundermeier RV Park or use your RV for Katy Trail trips, you know the convenience of having a trusted shop nearby. We're right down the road for pre-trip inspections, post-trip repairs, seasonal maintenance, and anything else your rig needs. No appointment months out — just real service from real techs.

What We Do

  • Roof repair and full replacement — EPDM, TPO, fiberglass, rubber
  • Water damage restoration — floor rot, wall delamination, slide-out leaks
  • Electrical diagnostics — 12V, 120V, inverters, solar, coach wiring
  • Slide-out repair, alignment, and seal replacement
  • Brakes and suspension — trailers and 5th wheels
  • Appliance repair — Dometic, Norcold, Suburban, Atwood
  • Aqua-Hot hydronic heating — certified
  • Onan generator service and rebuilds — certified
  • Plumbing — freshwater, grey, black systems
  • Awning repair and replacement
  • Complete RV rebuilds and renovations
  • Horse trailer repair and service
  • OEM and aftermarket parts department
  • Secure RV storage

Factory Authorized

Newmar, Tiffin, and Keystone. We also service Fleetwood, Monaco, Winnebago, Thor, Forest River, Coachmen, Heartland, Grand Design, and every other manufacturer.

Getting Here from St. Charles

Take I-70 West to Highway 47 South into Union. About 40 minutes. 7819 Highway 47 S, Union, MO 63084.

Call us at (636) 583-2244 or Book an Appointment online.