Welcome to IRV2
. You have come to the right place. We asked the same question before we bought our used Journey and folks here were very helpful.
My suggestions:
1. As suggested, if the tires are original, try to get them replaced as part of the deal. While they have few miles and may look fine, they are near the end of their useful (and safe) life.
2. Put on some coveralls and get a creeper and flashlight and inspect the underbelly well. Look for hydraulic leaks (in the slide out system/hoses), oil leaks, rust, etc.
3. At seven years, you are also looking at end of life for engine belts/hoses, so you may want to consider that.
4. Insist on maintenance records...evidence of regular oil/filter changes, chassis lube, fuel filter changes, engine air filter, and look for a complete cooling system flush and re-fill (the recommended life of antifreeze was either 3 0r 5 years...you can call Freightliner and give them the chassis serial # and they will tell you what antifreeze was put in at the factory and its recommended life). The air dryer should have been serviced at this point. While the miles are low, the tranmission should have been serviced (initial plus intervals) fluid and filter changes. Keep in mind that the maintenance intervals for a DP are based on miles and/or time, whichever comes first. If the tranny has Dexron in it, it should have been changed (along with the filters) at least every 2 years IMO.
4. Look carefully inside all exterior compartments for evidence of any leaks. Do the same in the interior...pull out drawers and look in the bottom of cabinets.
Bottom line, the Journey is a good value coach. While all of them require maintenance and some periodic repairs, we have never regretted getting ours.
When you get it, come back often with any questions and to share your RV experiences.
Safe travels.