Tiffin Phaeton 40IH vs American Coach American Eagle 45K
The difference that matters
These sit in different tiers. The Phaeton 40IH is a 41.3 ft mid-luxury pusher on Tiffin's PowerGlide XC with a 450 hp Cummins L9, a 40,000 lb GVWR and a 10,000 lb tow rating. The American Eagle 45K is 44.9 ft on a Freightliner SL tag-axle chassis with UltraSteer, a 605 hp Cummins X15 with Allison 4000, a 54,000 lb GVWR and a 20,000 lb hitch.
The Eagle's extras are chassis and finish: RoadWatch adaptive cruise and collision mitigation, BrakeSync, an active tag axle that tightens turns, two power basement slide trays, a Fisher and Paykel cooktop, Cambria quartz counters, theater seating with a sleeper sofa, a 12.5 kW Onan and a 150 gal fuel tank.
The Phaeton covers the essentials: three 200 W solar panels, a 3,000 W inverter, a 10.0 kW Onan diesel, hydronic heat, four slides and room for six. It carries more gray and black capacity too, 100/55 gal against 70/50, with fresh water close at 100 against 105.
- Tiffin Phaeton 40IH
- Well-equipped diesel pusher shoppers, couples or families, wanting solar, hydronic heat and four slides.
- American Coach American Eagle 45K
- Buyers who want a 45 ft tag-axle flagship with driver aids, a heavy tow rating and top finishes.
Weights
Weights
2027 maker figures
- GVWR
- 40,000 lb
- Dry weight (UVW)
- not published
- Occupant + cargo (OCCC)
- not published
- Towing capacity
- 10,000 lb
Weights
2027 maker figures
- GVWR
- 54,000 lb
- Dry weight (UVW)
- not published
- Occupant + cargo (OCCC)
- not published
- Towing capacity
- 20,000 lb
Spec for spec
| Tiffin Phaeton 40IH | American Coach American Eagle 45K | |
|---|---|---|
| GVWR | 40,000 lb | 54,000 lb |
| Towing capacity | 10,000 lb | 20,000 lb |
| Exterior length | 41.3 ft | 44.92 ft |
| Exterior height | 13.3 ft | 13.08 ft |
| Sleeps | 6 | — |
| Slide-outs | 4 | — |
| Fresh water | 100 gal | 105 gal |
| Gray water | 100 gal | 70 gal |
| Black water | 55 gal | 50 gal |
| Factory solar | 600 W | — |
| House battery | (6) 6V 210Ah extended-cycle AGM (lithium optional) | Lithium GC3 3x 270Ah is an OPTION (standard bank not stated) |
| Generator | 10.0 kW Onan Quiet Diesel | Onan 12.5kW QD with auto gen start |
| Chassis | Tiffin PowerGlide XC raised-rail rear-engine diesel | Freightliner Custom Chassis SL (Liberty Bridge), tag axle with UltraSteer |
| Engine | Cummins L9 450 HP | Cummins X15, 605 hp / 1,950 lb-ft, Allison 4000 6-speed, 3-stage engine brake |
| Fuel | Diesel | Diesel |
Bold is the lighter or larger figure. A dash means the maker does not publish it.
To scale
- Tiffin Phaeton 40IH · 41.3 ft long · 13′4″ tall
- American Coach American Eagle 45K · 44.92 ft long · 13′1″ tall
Tiffin Phaeton 40IH
Full spec sheet, sources →
American Coach American Eagle 45K
Full spec sheet, sources →

