I have done an outwell Montana 6 (I think, defiantly 6 person tent) to a Vango Hudson. I did it to give children somewhere to play in the evenings, so didn't matter that it had a few gaps and wasn't a proper fit. Worked really well for a bit of cover. Not sure it helps??🤔🙄😂
Thanks for replying. I've looked at the dimensions of my outwell tent and vango extension and there not too far off so ill just give it a try when I can.