Floor plan
Double Slide
Two-slide layout with front parlor, mid galley, and rear master suite
Click to enlarge
2026 Marathon Coach
2026 Marathon H3-45 Conversion for Sale
We don't sell this from a lot. RVBrokers is a buyer's agent, so we help you find, price, and negotiate this model wherever it is, and line up an inspection before you pay.
Marathon's flagship build on Prevost's newest H3-45 chassis — the pinnacle of bus-conversion luxury.
The H3-45 is the coach that defines modern Marathon. Built on Prevost's latest-generation H3-45 chassis — the platform Marathon was first in the world to convert into a luxury RV — it pairs a 500-horsepower Volvo D13 diesel and Allison six-speed with the brand's most advanced interior to date. Expect four Valid slide-outs that vanish into the bodywork, Crestron control of lighting, shades, and climate from an iPad, residential Fisher & Paykel and Miele appliances, and a master suite with a king bed and motorized headlift. At a full 45 feet on a 55,000-pound air-suspension chassis, it rides like nothing else on the road. This is a numbered, one-off build configured to order — exceptional comfort, exceptional cost, and the current high-water mark of what Marathon does.
Looking for a Marathon H3-45 Conversion for sale?
You're in the right place. We don't sell the H3-45 Conversion off a lot — we work for you, find the cleanest one on the market new or used, inspect it, and negotiate it. Below is everything you need to know before you shop: the real specs, every floor plan, the photos, what it tends to sell for, and a straight read on what owners love and what they grumble about.
Gallery
H3-45 Conversion — inside & out
Specs
H3-45 Conversion specifications
Length45'
Sleeps6
Bathrooms1 – 1.5
ChassisPrevost H3-45, air suspension, 55,000 lb GVWR
EngineVolvo D13 500 HP Diesel
TransmissionAllison 6-speed Automatic
GeneratorDiesel generator (coach-specific)
StorageFull pass-through basement bays with slide-out trays
Specs reflect the 2026 model year and can vary by floor plan and options.
Floor plans
2 H3-45 Conversion floor plans
Tap any diagram to see the full layout. The floor plan you choose changes the sleeping setup, bath, and storage — it's the single biggest decision on this coach.
Click to enlargeFloor plan
Quad Slide
Four Valid slide-outs for maximum interior volume across parlor, galley, and bedroom
Click to enlargeOwner verdict
What buyers love and what to watch
What buyers love
- The newest, most refined chassis Marathon builds on, with first-mover conversion expertise.
- Commercial-grade Volvo D13 drivetrain engineered for a million-plus miles.
- Dense, genuinely useful automation and residential-grade appliances throughout.
What to watch
- Flagship pricing — new builds start around $3 million and climb from there.
- 45 feet and 55,000 pounds demand a capable Prevost-experienced service network.
- Roughly 6.5 mpg and commercial service intervals make ownership costs serious.
Notable features
- Prevost's newest H3-45 chassis — Marathon was first to convert it to a luxury RV
- Crestron control of TVs, motorized shades, and climate from iPad tablets
- Valid flush slide-outs that blend seamlessly into the exterior
- Residential galley with Fisher & Paykel and Miele appliances and a king master with motorized headlift
Questions
Marathon H3-45 Conversion — buyer FAQs
How much does a Marathon H3-45 Conversion cost?
New builds start around $3 million (conversion alone over $1.7M); late-model pre-owned in the seven figures. Price swings hard on year, mileage, slide count, and condition, so treat that as a starting point — tell us the exact coach you're eyeing and we'll get you the real number.
Is the H3-45 Conversion gas or diesel?
Diesel. It runs a Volvo D13 500 HP Diesel on a Prevost H3-45, air suspension, 55,000 lb GVWR chassis.
How big is the H3-45 Conversion?
It's 45' long and sleeps 6. There are 2 floor plans to choose from.
Should I get a used H3-45 Conversion inspected before I buy?
Yes — every time. Our independent inspectors check the roof, slides, levelers, and chassis before money moves, and our buyer's agents use anything they find to negotiate the price down.
Talk to a human
Ready to find your H3-45 Conversion?
Tell us the floor plan and budget you want. We'll hunt the best one for sale, inspect it, and negotiate it — entirely on your side.