Are you wondering what the best used diesel pusher class A motorhomes are? Diesel pushers remain the ultimate full-time or snowbird rig. The big question today is: go pre-DEF (2009 and earlier) for simplicity and lower long-term ownership cost, or post-DEF (2015–2022) for modern tech and higher resale? Note that most Pre-DEF RV parent companies went bankrupt during the 2008 financial crisis and some of the names were purchased after bankruptcy by new companies – but those RVs have nothing to do with the older ones.
Why Pre-DEF Coaches Are Having a Renaissance Today
- No DEF fluid, no regen cycles, no SCR/DPF sensors
- 8–12 MPG real-world (many owners still hit 10+ towing)
- Any heavy-truck shop can service them
- DEF fluid prices are up 20–30 % nationwide — pre-DEF owners just smile and keep driving
The Oregon-Built Pre-DEF Icons (2005–2009)
Brand | Signature Chassis | Key Chassis Advantages | Typical Engines | Current Used Price Range |
|---|---|---|---|---|
Country Coach | DynoMax (in-house) | Dyno-tested per coach, perfect balance, welded aluminum, almost zero vibration | Cummins ISL 525 / CAT C13 505 | $110k–$140k |
Beaver | Roadmaster (custom Monaco-built) | Electro-coated steel, integrated tag axle, legendary handling | Cummins ISL 400–425 / CAT C9 400 | $90k–$125k |
Monaco | Roadmaster (in-house) | Electro-coated bridges, custom tag axle, ultra-quiet ride | Cummins ISL 400 / CAT C13 425 | $80k–$115k |
Holiday Rambler | Roadmaster Scepter | Same electro-coated protection, optimized for HR floorplans | Cummins ISL 400 / CAT C13 425 | $75k–$110k |
These four brands were all built within 90 miles of each other in Oregon and still dominate “best ever built” conversations in RV circles to this day
What to Inspect on Any 15–20-Year-Old Pre-DEF Coach
Expect some (or all) of these items to need attention — every single one is normal wear on a 2005–2009 coach:
- Roof TPO membrane and sealant (cracking/deterioration)
- Slide-out seals, topper awnings, and floor condition underneath slides
- Slide mechanism motors and gears
- Air suspension bags, height-control valves, and air dryer
- Multiplex wiring modules (especially 2005–2007)
- Chassis batteries, house batteries, and inverter/charger
- Engine belts, hoses, coolant, and radiator condition
- A/C units (roof and basement) — shrouds, gaskets, and capacitors
- Water heater, furnace, and Aqua-Hot/Webasto systems (if equipped)
Pro tip: Budget for a complete “recommissioning” after purchase (tires, brakes, fluids, belts, batteries, roof reseal). Once that’s done, most owners cruise trouble-free for years.
More: Your Guide To RV Discount Cards and Memberships
Post-DEF Standouts (2015–2022 Models)
Brand | Chassis | Engine Options | Real-World MPG | 2025 Used Price Range | Owner Satisfaction |
|---|---|---|---|---|---|
Newmar Dutch Star | Spartan K2 | Cummins ISX15 450–600 HP | 8–10 towing | $180k–$250k | 98 % |
Entegra Aspire | Spartan K2 | Cummins ISX15 450–605 HP | 9–11 unloaded | $200k–$280k | 97 % |
Tiffin Allegro Bus | PowerGlide / SumoFrame | Cummins ISX15 450–605 HP | 10–12 unloaded | $170k–$240k | 96 % |
Post-DEF extras you’ll love: factory solar prep, lithium-ready electrical, LED everything, and modern safety systems.
Post-DEF items to inspect: DEF tank & sensors, DPF filter condition, and regen history.
Your Buying Cheat Sheet
Your Budget | Recommended Coach | Why It Wins Right Now |
|---|---|---|
$75k–$110k | 2006–2009 Monaco / Holiday Rambler Roadmaster | Cheapest luxury entry, parts everywhere |
$100k–$140k | 2006–2009 Country Coach DynoMax or Beaver Roadmaster | Highest build quality ever produced |
$170k–$250k | 2018–2022 Newmar Dutch Star | Best combination of drivability, resale, and support |
Full-time boondocking | Any pre-DEF Oregon coach + modern lithium/solar upgrade | Zero DEF drama, simpler systems, lower running cost |
Bottom Line
- Want the absolute finest coach ever mass-produced and don’t mind a refresh budget? → Country Coach or Beaver on DynoMax/Roadmaster chassis.
- Want turn-key modern luxury with factory warranty remaining? → 2018+ Newmar Dutch Star.
Either route, hire a certified inspector and sleep easy knowing you just bought one of the best highway homes ever built. Join owners groups for the inside scoop on performing maintenance and locating parts. Chat with current and former owners for a notch up in experience so you’ll know what to look for and expect.
Happy RVing!
