1ciderdog has given you some very good information. My previous motorhome was a 2006 Winnebago Journey 36G with the 350 Caterpillar engine on the Freightliner chassis. I had very good luck with it except for the normal maintenance items. One thing to check would be the tire age. Anything over 5 to 7 years old should be replaced regardless of mileage. That year Caterpillar engine has had premature radiator fan bearing failure. You can do a search on this forum for others who have gone through this problem. Also the rear radiator/CAC cool pack should be cleaned annually to prevent engine overheating problems.
I enjoyed my Winnebago Journey and almost wish I had it back. They are built very well and if the floorplan meets your needs, Go For It and enjoy.