Yuki, welcome to iRV2.com. We are glad to have you join us here and look forward to reading of your adventures and experiences.
Check the basement air conditioning on a hot day to be sure it cools the entire coach satifactorily. Some floor plans had a problem with the return air ducting under the bed being restrictive; especially when the slideout was retracted. Other than this I cannot think of any thing else.
The coach should be completely gone through and prepped and detailed for delivery after you have signed a buyers agreement. If this is done, you should not have any real issues unless something breaks on a shakdown run and has a warranty to cover it for at least a year.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7