Hi Mel, I don't own a 30' but a 22' 1991 Lazy Daze.
They are strongly built and hold up well. Like any camper, you want to look for water leak damage. The Lazy Daze gets less leaks than others due to the one-piece aluminum roof (after 1990) and the way the windows are made and installed.
Also, over time, the bolts that hold the house to the frame can loosen so you'd want to make sure they're good and tight.
Lazy Daze don't use sliders so you have that whole set of problems eliminated.
I think the most things you need to be concerned with is the truck part of the camper. Brakes, transmission, tires. (especially tires - don't want old or cracked ones)
Lazy Daze owners are very proud and faithful to the brand.
You might also look into the Yahoo group: Life with A Lazy Daze RV: https://groups.yahoo.com/neo/groups/...azydazerv/info