A revenue declaration of conversion SQI (suitable qualified individual ) is required when a vehicles seating number, chassis length, wheel configuration, body type, body weight, purpose of use has changed or there is a discrepancy on the logbook . Typical conversions would include camper van conversions, horse box conversions, commercial vehicle bodies changed to recovery bodies, box bodies, tipping bodies, curtain sider, luton bodies and beaver tail. Commercial jeeps converted to passenger. Seats added or removed to any vehicle.
SQI Declaration of Conversion form below.
http://www.revenue.ie/en/tax/vrt/forms/vehicle-conversion-declaration.pdf