2025 Thor Aria 3401 vs 2025 Thor Aria 3901

Detailed Comparison

Head to head, the 2025 Thor Aria 3401 and the 2025 Thor Aria 3901 each bring unique strengths to the table. Which one deserves a spot in your driveway?

The Thor Aria 3401 measures 35.5 ft in length at 23,700 lbs, compared to the Thor Aria 3901's 35.0 ft and 16,800 lbs. GVWR ratings sit at 26,100 lbs and 20,800 lbs respectively.

For sleeping arrangements, the Thor Aria 3401 offers room for 4 and the Thor Aria 3901 can handle 5. The Thor Aria 3401 benefits from 3 slide-out(s), expanding the interior when parked.

Looking at self-sufficiency, the Thor Aria 3401 packs 97 gal of fresh water and 300W of solar. The Thor Aria 3901 counters with 91 gal fresh water and 600W solar.

Price is often the deciding factor. The Thor Aria 3901 starts at $313,000 MSRP, while the Thor Aria 3401 commands $321,000 — a $8,000 gap.

Off-grid campers should pay close attention to solar wattage, battery capacity, and tank sizes. Full-timers should prioritize tank capacity, storage, and overall living comfort.

Take these specs as a starting point, then go see them in person — there's no substitute for stepping inside.

When it comes to water management, tank capacity plays a major role in how long you can stay off the grid. The 2025 Thor Aria 3401 holds 97 gallons of fresh water compared to 91 gallons in the 2025 Thor Aria 3901, giving it a 6-gallon advantage for extended dry camping. Gray water capacity favors the 2025 Thor Aria 3401 at 64 gallons versus 41 gallons, which directly affects how often you need to find a dump station. Black water tanks are evenly matched at 37 gallons each, meaning dump station visits will be equally frequent for both rigs.

Electrical systems are increasingly important as RVers rely on more electronics and appliances. With 600W of solar, the 2025 Thor Aria 3901 outpaces the 2025 Thor Aria 3401's 300W setup, offering better energy independence away from hookups. Battery storage gives the edge to the 2025 Thor Aria 3901 with 350Ah versus 300Ah, translating to longer run times for lights, fans, and charging devices overnight. The 2025 Thor Aria 3401's 2500W inverter can handle heavier loads than the 2000W inverter in the other unit, which matters if you plan to run a microwave, coffee maker, or hair dryer without shore power.

For solo travelers and couples who value maneuverability, the 2025 Thor Aria 3901 with its more compact footprint will be easier to navigate through tight campgrounds and mountain passes. Families with children should lean toward the 2025 Thor Aria 3901, which sleeps up to 5 and provides more flexibility for overnight guests. Full-time RVers who spend extended periods off-grid will benefit most from the 2025 Thor Aria 3901's power setup and the 2025 Thor Aria 3401's water reserves, as these directly impact daily comfort and independence from hookups. Weekend warriors and seasonal campers who primarily stay at full-hookup campgrounds may find that the differences in tank sizes and power systems matter less, allowing them to focus on floor plan preference and overall comfort instead.

From a value perspective, the 2025 Thor Aria 3901 at $313,000 MSRP represents a $8,000 savings over the 2025 Thor Aria 3401 at $321,000, a 3% price difference. Breaking it down per sleeping position, the 2025 Thor Aria 3401 costs roughly $80,250 per berth while the 2025 Thor Aria 3901 comes in at $62,600 per berth. On a cost-per-foot basis, the 2025 Thor Aria 3401 runs about $9,042 per linear foot versus $8,943 for the 2025 Thor Aria 3901, which helps contextualize the value each unit delivers for its size. Since both models come from Thor, buyers can expect consistent build quality, a shared dealer network, and comparable warranty coverage, which simplifies the after-purchase ownership experience.