Not wishing to scaremonger Carl, but I do think it’s worthwhile mentioning not only the additional load of the bike rack and bikes, but more significantly the potential effect of this load when attached at height to the rear of your van.
Most swift models from the past few years (starting from 2016, or maybe even 2015 ? ) have the standard Thule cycle rack bars, but you won’t see many carrying bikes. Depending on the type and number of bikes you want to carry, having some 30-50KG’s dangling of the back of the van, especially at such a height is considered by many (myself included) to be a far from ideal way of configuring your van’s payload. On a Motorhome, I wouldn’t think twice, but not on a caravan, especially not a single axle. Our bikes are on the roof of the car.
Safe travels,
Ic.