Also, as far as towing capacity goes, I looked it up and couldn't find the Spacio specifically but Yaris were 300 kg and most models of Corolla were 400 kg, so if you had a hitch installed you could pull a very light trailer or easily handle something like this:
https://www.amazon.com/Leader-Accessories-Folding-Capacity-Receiver/dp/B07DK497SP/
I wouldn't expect a cot and stroller to weigh more than maybe 35-40 kg
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As you can see from my picture My old corolla wagon with 1.6 l engine had both a roof rack and a hitch mounted carrier, and I certainly exceeded the gvwr with all the cargo inside (was moving a lot of heavy metal tools), but I just drove slowly and left myself lots of room to stop and things went well.