Fleetwood Palisade 45DS vs Newmar Supreme Aire 4129
2027 Class A comparison · side-by-side specs, verdict, and who each is best for.
Quick verdict
Two flagship Class A diesel coaches near $700K MSRP with sharply different drivetrain and electrical bets. The Fleetwood Palisade 45DS is a 44.7-ft three-slide on the Freightliner XCM Freedom Bridge chassis with a Cummins L9 450 HP, 46,000-lb GVWR, six 6V AGM batteries, and an Onan 10 kW diesel genset. The Newmar Supreme Aire 4129 is a 41.9-ft four-slide on the Freightliner Cascadia 116 with a Detroit Diesel DD13 525 HP, 800Ah lithium bank, no propane, and a 12,500W generator at 41,000-lb GVWR.
The Newmar Supreme Aire 4129 leads on engine output (525 vs 450 HP), house battery (800Ah lithium vs AGM six-pack), fresh water (150 vs 100 gal), generator size (12.5 vs 10 kW), and adds four-season construction. The Fleetwood Palisade 45DS wins on GVWR (46,000 vs 41,000 lbs), length (44.7 vs 41.9 ft), and includes theater seating plus an integrated 2,800W inverter. Pricing puts the Newmar $3,996 below the Fleetwood at $702,852 versus $706,848.
The Palisade 45DS suits buyers who value Fleetwood's hand-laid tile, full body paint, and higher GVWR for full loading. The Supreme Aire 4129 suits buyers who want the biggest diesel and a modern all-electric architecture.
Side-by-side specs
| Fleetwood Palisade 45DS | Newmar Supreme Aire 4129 | |
|---|---|---|
| MSRP | $706,848 | $702,852 |
| Length | 44'8" | 41'11" |
| Dry weight | — | 37,000 lbs |
| GVWR | 46,000 lbs | 41,000 lbs |
| Sleeps | 4 | 5 |
| Slides | 3 | 4 |
| Fresh tank | 100 gal | 150 gal |
| Grey tank | 75 gal | 85 gal |
| Black tank | 50 gal | 52 gal |
| LP | — | 0 gal |
| Solar | 100W | — |
| Inverter | 2800W | — |
| Generator | 10000W | 12500W |
| Bath | — | full |
| Bed | king | king |
| 4-season | No | Yes |
| Off-road | No | No |
| Outdoor kitchen | No | No |
| Washer/dryer | yes | prep |
| Residential fridge | Yes | Yes |
Where Fleetwood Palisade 45DS wins
- 46,000-lb GVWR vs 41,000 lbs on Newmar - 5,000 lbs more capacity
- Longer 44.7-ft floor plan vs 41.9 ft
- Onan 10 kW genset with generator prep
- 2,800W inverter integrated standard
- Hand-laid tile showers, Apex Custom Furniture, full-body paint
Where Newmar Supreme Aire 4129 wins
- 525 HP Detroit DD13 - 75 HP more than the Palisade's L9
- 800Ah lithium house bank standard
- 150-gal fresh tank vs 100 gal on Fleetwood
- 12,500W diesel generator vs 10 kW Onan
- Four-season insulation and no LP system to maintain
Pick the Fleetwood Palisade 45DS if…
Pick the Fleetwood Palisade 45DS if you want the biggest, longest coach in this class with the highest GVWR available near $700K. The 44.7-ft length and 46,000-lb GVWR mean you can run a 12,000-lb tow car, full fuel, full water, and a fully-loaded basement without burning into chassis reserve. Fleetwood ships hand-laid tile showers, Apex Custom Furniture, Aqua-Hot 450D extended-stay hot water, and the brand's signature finish levels. The L9 450 HP is adequate for any grade in North America at this weight.
Pick the Newmar Supreme Aire 4129 if…
Pick the Newmar Supreme Aire 4129 if engine output and electrical modernity matter more than length. The Detroit DD13 525 HP/1,650 lb-ft is the biggest engine in the segment, the 800Ah lithium with no propane is the lowest-maintenance hotel system available, and four-season construction extends shoulder-season trips. The Freightliner Cascadia 116 chassis is an OTR truck cab with full air ride. At $702,852 you save $3,996 versus the Palisade 45DS while gaining a slide, more water, more genset, and a much bigger diesel.
Frequently asked
Which Class A has the higher GVWR?
The Fleetwood Palisade 45DS at 46,000 lbs GVWR carries 5,000 lbs more than the Newmar Supreme Aire 4129's 41,000-lb GVWR.
Does either coach run on lithium batteries?
The Newmar Supreme Aire 4129 ships with 800Ah lithium standard. The Fleetwood Palisade 45DS uses six 6V AGM batteries instead.
How much horsepower does each engine make?
The Newmar Supreme Aire 4129's Detroit DD13 makes 525 HP, while the Fleetwood Palisade 45DS Cummins L9 makes 450 HP - a 75 HP advantage to Newmar.