Best TowBar Cargo boxes

Here’s an updated “Best in Test: Tow-bar Cargo Boxes (2025)” overview — translated into English and including the aerodynamic / energy-consumption comparisons that matter most for EVs.

💡 In short: a rear-mounted box causes far less aerodynamic drag than a roof box — meaning ~15–20 % better efficiency and range on average for EVs.

🧳 Best Tow-Bar Cargo Boxes (Sweden 2025)

Model	Volume	Key features	Typical package price (SEK / EUR)	Notes
Thule Arcos (M / L)	M 300 L / L 400 L	Hard-shell, very aerodynamic; fits directly on Thule tow-bar platform	≈ 13 700 – 18 300 SEK (box + platform) ≈ €1 150 – 1 500	Low wind resistance; most efficient for EVs.
Thule BackSpace XT	300 L	Soft/hybrid; mounts on VeloSpace XT bike rack	≈ 16 000 – 17 000 SEK ≈ €1 350 – 1 450	Light; can combine with bike arms; foldable.
MFT BackBox	≈ 300 L	German modular box; high build quality	≈ 14 000 – 17 500 SEK ≈ €1 200 – 1 500	Heavy (two-person install); very stable.
TowBox V3 (by Aragon)	≈ 400 L	Rigid, large rear box; ventilated design	≈ 9 700 SEK ≈ €820	Great volume for money; check local availability.

(All prices excl. VAT; Swedish retail averages, Q4 2025.)

⚙️ Aerodynamic drag & energy impact

Setup	Typical impact vs. bare vehicle	Test references
Roof box (on top)	+18 – 23 % higher fuel or energy use (≈ –40 km range on an EV)	Vi Bilägare 2025; ADAC; Car and Driver 2025
Tow-bar / rear box	+5 – 8 % increase at 110 – 130 km/h	Car and Driver 2025; Vi Bilägare 2025
Empty roof vs. empty tow-bar rack	Roof rack adds ~ 2–4 %; tow-bar rack negligible	ADAC 2024

🏆 Quick recommendations

Use case	Recommended model
Most aerodynamic / best for EVs	Thule Arcos M or L
Multi-purpose (cargo + bikes)	Thule BackSpace XT + VeloSpace XT rack
Premium durability	MFT BackBox
Budget / large capacity	TowBox V3

⚠️ Checks before buying

• Confirm tow-ball nose weight (max vertical load) — boxes weigh 25–45 kg empty + load.
• Ensure lights & license plate visibility comply with local road rules.
• For EVs, prefer boxes that sit close to bumper height — less turbulence behind the car.
• Remove the box when not in use — saves energy and avoids sensor interference.