The bulk of the few examples I can find that are post 2015 are 1.2’s and I’d imagine they’d struggle a bit with a full load of family and gear while the stronger 1.4 is rarer and dearer.
Personally, I don't think the 1.2 would struggle. But I guess expectations come into it, i.e, how much power and performance you are used to, along with how fast you drive. The reason I say this is because if dealing with a heavy load, having plenty of torque at low revs is much more useful and important than the BHP figure. And in this respect, the Touran 1.2TSI offers (IMO) plenty, at very low revs
If we look at everyones favourite (for reliability) compact MPV, the Toyota Verso. In (n/a) 1.6 form, this offers 132bhp against the Touran 1.2TSI's 105BHP, a sizeable difference in percentage terms, which may lead you to believe the Verso would be better fully laden. But look at the torque and it is a different story, with the Touran giving 175nm from 1550-4100rpm and the Verso managing 160nm, but not till way up at 4400rpm.
So while a Touran 1.2TSI may be some way short of an S Max turbo diesel for both power and torque, I really don't see it struggling as long as your expectations are in line with the fact that it isn't a fast or powerful car. Personally, I'd sooner have the Touran unless you actually need the extra space of the S Max, which is a fair chunk bigger, and I'd be absolutely fine with the 1.2TSI (unless towing a caravan or something!)
I drive a 2010 VW Caddy for my work, which as most will know, is based on the Touran. Mine has a 2.0 non turbo diesel which makes 70bhp and 140nm of torque @ 2200 rpm. I start each day with 400kg of water in the back, along with various other stuff. No, it isn't fast, but it manages just fine.
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