Congratulations on your upcoming purchase. Learning everything you can before you pick up the rv and start living in it will help make the experience an enjoyable one.
BEFORE you sign the final purchase documents, learn how everything works during your 'walkthrough' and final inspection. Make certain everything is fixed before you sign the documents and end up in the repair shop. It can take months to get things fixed after you sign the documents and you don't want your trip delayed. People are making payments on a rig that are sitting in shops waiting for warranty repairs.
Of course, most people complete their purchase with no problems and I hope that's your experience.