Hey Cafe Latte,
I think if its just you and the Mrs you'll be fine. The diesel JK Unlimited can tow 2,200 kg. And those 412kg is after all fluids (ie full tank) has already been added to the Jeep. So, you'd have 412kg to load although it includes you and the Mrs within those 412kg. Just to cover the servicing period of Defender you'd be ok? Unless, to service the Defender is a multi-week affair, haha
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Jeep does not state what's the total combined weight for the trailer and the jeep. At least it wasn't on the website. 2,200 kg to tow isn't too bad...
But yeah, in my case, 412 kg for a family of four including the passengers and with a roof top tent isn't that much at all. I know I'll do only one family trip per year but still, once on the road I'd like to be within the limits or at least not too much over, haha.
I really like the payload of the Defender! Hmmmm...