Information about buying a used quad

Hello experts, here is an absolute quad newcomer asking for your experiences. I’m thinking about buying a quad and I’ve got a few thoughts on the conditions. Here are my wishes: – No China-buller (I’ve already read a lot about this and I don’t want to buy 2x.) – Should real 100km/h run (not just after my own tacho) (I don’t want to be able to overtake trucks, but I don’t like to have them sitting too tight in the neck) – Road registration for 2 people (2 people + 1 bag = approx. 200 kg payload, my girlfriend is slim, but I don’t) – Used in good condition other optional features: – Train rail registration (What can a part of it pull and what is realistic?) – All-wheel (What is the difference in behavior, maybe they are safer on the road?) I don’t have plans to go with the device into heavy terrain or even jump. The normal use will be on the road, possibly a dirt road here and there. Since I don’t have a car more I could also imagine an occasional winter use (of course with appropriate clothing). Is that realistic or would it be like a suicide attempt? Where I live is almost never snow. Who can call me corresponding companions with (if possible) the following information: – price I should invest to get quality and nothing too sucked out – consumption/100km – annual maintenance costs at approx. 3000 km/year (maintenance etc.) – insurance and taxes (does a season mark make a big difference?) – What are the weaknesses that need to be taken into account when buying a used quad? – Realistic mileage to Exodus. Otherwise, a few questions: – How much does a quad suffer when it is outside? (Unfortunately, I don’t own a garage.) – I live in the Cologne area. Who can call me trusted dealers? – What else is there to consider or consider? I know that I ask many questions here and hope that danoc h that a few experts take the time to answer a few of them. All the comments on points that I have forgotten, but which might be important in making a purchase decision are welcome. Thank you Georg