Purchase advice Trafic III

Hello all, I’m looking for a van/bus as a family bomber (father, mother, two children) in the medium term. I stumbled across the pricely very attractive Trafic of the third generation. Now I would like to listen a bit to the community to get a feel for the Do’s and Don’ts. The following aspects and questions are included: 1) I’ve already read opinions on climate and heating here in the forum. The tendency was: everything that goes: climate front + back, Z uheatier, extra heating. More views on this? 2) How do you see the seating and suspension comfort on the long distance? Use case family/ski holiday in the Alps for example. 3) Which radio/navi is usable? Is the price for an R-link justified, or do you prefer to leave it. 4) What about the engines? I prefer the 125er. The 2,000,- extra price for the 145er is not worth it from the data on paper. By the way: Are the engines all today too with Renault with additive (urea / SCR)? (To be honest, this makes me completely degenerate, if after a few thousand km I have to tip in some kind of stinky mud splörre.). 5) Topic seats: Are there (except the additional number of places) other good reasons for a double seat in front? Or should one not take it by any means, because the single seat is so much bigger and more comfortable? What else have I forgotten? Do you still see equipment, which one definitely or (I used to have a traffic expression with dCi 125 on a large new car platform on the Internet, so to speak, up to a maximum of 31,000 euros. That’s a great price, I think. That’s why I would tend to be a “full hut”.)