Welcome. A local over nighter done two weeks before departure testing all the systems before all the stuff is loaded makes a lot of sense. Then there is still time to get a repair accomplished without messing up your schedule.
If you have a tire with a slow leak, try a different valve cap and see if that stops the leak. Had a defective valve cap incident happen on a motorcycle trip once. It began pushing on the shredder valve and letting the air out very slowly.
WBCCI Life Member 5123, AIR 70341, 4CU, WD9EMC
TV - 2012 Dodge 2500 4x4 Cummins HO, automatic, Centramatics, Kelderman level ride airbag suspension, bed shell
2014 31' Classic model 30 twin beds, 50 amp service, 900 watt solar system, Centramatics, Dill TPMS, disc brakes, 16" tires & wheels