Thinking differently: which car to keep? Hunday Trajet or Chevy Kalos or both away?

Moin, I’m facing the following problem: We buy a new car (non-discussable, the wallet is available) Dacia Dokker Celebration because of the large space offered and because it’s the one with LPG drive, there’s no big extra cost (which can be found at the purchase then quite elsewhere) We’re currently driving: Hyundai Trajet 2Ltr 130 hp (I think) with LPG 210,000 km Chevrolet Kalos 1.2 liters 72 hp, LPG , 130,000 km Both cars have their age traps (A/C is flat, the chassis crackles), which Engines both run without sounding. Possible problems with the Hyundai is the alternator (the battery only charges properly on long distances, the workshop claims the charging voltage would be a little too low), the gas pump from the LPG drive, other aggregates such as the steering hydraulics, water punpe etc. pp. At the kalos the suspension kranks when steering left, especially if it is warm, when it is cool and damp, there is almost nothing to hear (m.E. must definitely soon in the workshop) Brake n new, spark plugs and ignition cables. I can’t say anything about the aggregates off the A/C. The following thoughts guide me: I would rather keep the trajet because the lot of cargo space offers. The kalos is younger, but offers hardly any space and on long distances it is really exhausting to drive. (place we need, and it often goes across Germany) With both vehicles I can’t judge the possible lifespan, I find no reasonable statements. Motor for the more durable, but what about the other units? (I found one at autoscout24 with 300,000 km) So there are the following possibilities: 1. Keep Trajet 2. Keep Kalos 3. Do not pump all the money into the Dokker, but sell both end-of-life vehicles and buy a younger used with LPG for the Dokker. (But which?) The crux is: I can’t judge how durable the Kalos or the Hyundai is. I know that this may only be about opinions. I would be grateful for any factual statement about these two vehicles regarding durability. Is there any other way of thinking that I don’t see? What is a good used alternative in the 4k€ range for the Trajet with similar room dimensions and good reliability? Thank you for reading, your patience and your expertise, also for opinions.