Vivaros are a nice van and should be ideal for what you are looking for, All vans have their problems and T5’s more than most!!
BUT
I have a 2.5 T5 and its just gone past 250k miles for a 2008 van.
Other than a couple of wheel bearings, a clutch and consumable items, nothing, and i mean nothing went wrong until I reached 230k. It then had an overhaul, new bushes droplinks etc.. new bigger turbo, intercooler, driveshaft, gearbox bearing, it still drives like the brand new T6 I tried the other day.
The bodywork has a few scrapes and dings but the interior is sturdy and rattle free…I hope to get an other 100k out of it…
The T5/6’s are overpriced, but I like them, and other brands make more sense but if I went past a T5 in a vivaro I will always wish I had one.. they are after all the new mid life crises van and I’m now in my 40’s