Sounds like the rig was taken care of that is a good thing as some older rigs were not, as far as parts go for the Terry these 5er's are more alike than different they pretty much all use the same parts reefer's,appliances, water heaters, furnaces, fixtures,tv's,suspension etc.. etc... so that will not be a problem for ya so just go out and enjoy you're Terry Quantum (I always liked them) and if something breaks you will find parts for it and find some RV shop to work on it if you cannot do it yourself no problem:)
2015 Montana 3735MK Legacy,2007 3500HD GMC Dually LBZ Duramax/Allison ,Pacbrake,Firestone Airbags Bullydog Tuner