My best suggestion, since this is your first RV, is to try and find an experienced RV'r who has owned diesel class A motorhomes, who would help you with inspection and suggestions.
Any used RV can be a real joy or pain, depending on what you get. A DP can be a complicated and expensive beast to use and maintain. Know that you can get an analysis of the engine oil and tranny oil to reveal hidden issues. Tires that are 5 - 6 years old are ready for replacement...typically 6 good tires will cost at least $2200 - 2500. There is so much more to consider.
You might want to check in with the Monaco Owners forum with specific questions about that rig.
Don't let yourself make too many compromises...this is a buyer's market and there are a lot of good, used rigs available. Take your time, good luck and enjoy the adventure.
'07 Country Coach Allure 470 Siskiyou Summit #31578, Cummins ISL 425; 2014 Ford F150 toad; Air Force One Toad Brake.
Glen Allen, VA; Smith Mountain Lake, VA.