MiRO: What it means and why it matters
MiRO (Mass in Running Order) is the weight of a caravan as it leaves the factory, including standard equipment, a full gas cylinder, and essential fluids. But without personal belongings or passengers.
MiRO replaced the older MIRO/MRO terminology in 2012 as part of European regulation harmonisation. It represents the "ready to use" weight of a caravan: body, chassis, standard fittings, a 90% full fresh water tank (if fitted as standard), one gas cylinder, and a 75kg allowance for the driver in motorhomes. The difference between MTPLM and MiRO is your available payload. The weight you have left for personal belongings, food, water (if not factory-filled), extra gas, awning, and accessories.
Why this matters
MiRO tells you the starting weight before you add anything. A low MiRO relative to MTPLM means generous payload. Many buyers focus only on MTPLM without checking MiRO, then discover they have surprisingly little room for gear.
Common misunderstandings
- MiRO is not the same as "empty weight". It includes gas, standard water, and essential fluids
- Dealer-fitted options (motor mover, solar panel, air conditioning) increase the actual weight above the published MiRO
- The 75kg driver allowance is only included in motorhome MiRO, not caravan MiRO
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Frequently Asked Questions
The caravan body, chassis, all standard factory equipment, one gas cylinder, and essential fluids. For motorhomes, it also includes a 75kg allowance for the driver.
No. Kerbweight applies to cars and motorhomes. MiRO applies to caravans and is defined under different European regulations.