2025 Opus OP4 vs 2025 Opus OP15

Detailed Comparison

Choosing between the 2025 Opus OP4 and the 2025 Opus OP15? Both are excellent options in the RV world, but they cater to different priorities.

The Opus OP4 measures 16.5 ft in length at 3,300 lbs, compared to the Opus OP15's 18.0 ft and 2,700 lbs. GVWR ratings sit at 8,100 lbs and 6,900 lbs respectively.

For sleeping arrangements, the Opus OP4 offers room for 4 and the Opus OP15 can handle 4.

Looking at self-sufficiency, the Opus OP4 packs N/A of fresh water and 100W of solar. The Opus OP15 counters with 2 gal fresh water and 100W solar.

Price is often the deciding factor. The Opus OP15 starts at $9,000 MSRP, while the Opus OP4 commands $24,000 — a $15,000 gap. That's a significant 167% premium you'll need to justify.

Weekend warriors will appreciate the easier towing and quicker setup of the lighter model. Couples who value intimacy and easy handling should lean toward the more compact option.

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 Opus OP15 features a 2-gallon fresh water tank for self-contained camping. Gray water capacity favors the 2025 Opus OP15 at 21 gallons versus 9 gallons, which directly affects how often you need to find a dump station. The 2025 Opus OP4 also leads in black water capacity with 6 gallons compared to 3 gallons, an important consideration for families or full-time travelers.

Electrical systems are increasingly important as RVers rely on more electronics and appliances. Both units arrive with 100W of solar capacity, providing a solid foundation for off-grid power generation. Both come with 1000W inverters, capable of running common household appliances when not plugged into shore power.

For solo travelers and couples who value maneuverability, the 2025 Opus OP4 with its more compact footprint will be easier to navigate through tight campgrounds and mountain passes. Both models sleep 4, making them equally viable for small families or couples who occasionally host guests. Full-time RVers who spend extended periods off-grid will benefit most from the 2025 Opus OP4's power setup and the 2025 Opus OP15'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 Opus OP15 at $9,000 MSRP represents a $15,000 savings over the 2025 Opus OP4 at $24,000, a 167% price difference. Breaking it down per sleeping position, the 2025 Opus OP4 costs roughly $6,000 per berth while the 2025 Opus OP15 comes in at $2,250 per berth. On a cost-per-foot basis, the 2025 Opus OP4 runs about $1,455 per linear foot versus $500 for the 2025 Opus OP15, which helps contextualize the value each unit delivers for its size. Since both models come from Opus, buyers can expect consistent build quality, a shared dealer network, and comparable warranty coverage, which simplifies the after-purchase ownership experience.