2025 Thor Aria 3901 vs 2024 Tiffin Allegro 32SA

Two popular options on many shoppers' shortlists — the 2025 Thor Aria 3901 and the 2024 Tiffin Allegro 32SA. Let's see how they compare across the specs that matter most.

Specifications Comparison

Specification2025 Thor Aria 39012024 Tiffin Allegro 32SAAdvantage
CategoryClass AClass A
Year202520242025 Thor Aria 3901
Length35 ft27 ft
Width8 ft8 ft
Height13 ft11.5 ft
Dry Weight16,800 lbs25,900 lbs
GVWR20,800 lbs29,900 lbs
Sleeping Capacity572024 Tiffin Allegro 32SA
Fresh Water91 gal93 gal2024 Tiffin Allegro 32SA
Gray Water41 gal53 gal2024 Tiffin Allegro 32SA
Black Water37 gal48 gal2024 Tiffin Allegro 32SA
Fuel Capacity125 gal97 gal2025 Thor Aria 3901
Horsepower397 hp332 hp2025 Thor Aria 3901
EngineCummins ISB 6.7LFord 6.8L V10
Slide-Outs142024 Tiffin Allegro 32SA
Solar600 W400 W2025 Thor Aria 3901
Battery350 Ah350 AhTie
Inverter2,000 W2,500 W2024 Tiffin Allegro 32SA
MSRP$313,000$310,0002024 Tiffin Allegro 32SA

Detailed Comparison

Two popular options on many shoppers' shortlists — the 2025 Thor Aria 3901 and the 2024 Tiffin Allegro 32SA. Let's see how they compare across the specs that matter most.

In terms of footprint, the Thor Aria 3901 stretches 35.0 ft while the Tiffin Allegro 32SA spans 27.0 ft. Weight-wise, the Thor Aria 3901 is the lighter rig at 16,800 lbs versus 25,900 lbs.

The Thor Aria 3901 sleeps 5 while the Tiffin Allegro 32SA accommodates 7. Slide-outs play a role in livability: the Thor Aria 3901 has 1 and the Tiffin Allegro 32SA has 4.

For boondocking enthusiasts, tank sizes matter. Fresh water capacity goes to the Tiffin Allegro 32SA at 93 gallons versus 91 gallons. Solar-wise, you get 600W on the Thor Aria 3901 and 400W on the Tiffin Allegro 32SA. Battery banks are 350 Ah and 350 Ah.

At $313,000 MSRP for the Thor Aria 3901 and $310,000 for the Tiffin Allegro 32SA, the Tiffin Allegro 32SA saves you $3,000. With only a 1% price difference, the choice comes down to features rather than cost.

If you're traveling with a family, look for the model with more sleeping positions and better storage. Boondockers: look at the fresh water capacity and solar/battery systems — they determine how long you can stay out. For the full-time RV lifestyle, every gallon of tank capacity and every inch of counter space counts.

At the end of the day, the best RV is the one that fits your travel dreams and budget. Either of these is a worthy choice.

Individual Overviews

2025 Thor Aria 3901

  • Category: Class A
  • Length: 35 ft
  • Weight: 16,800 lbs
  • Sleeps: 5
  • MSRP: $313,000
View Full Specs

2024 Tiffin Allegro 32SA

  • Category: Class A
  • Length: 27 ft
  • Weight: 25,900 lbs
  • Sleeps: 7
  • MSRP: $310,000
View Full Specs