We have a 2002 Suncruiser 35U with a Workhorse chassis. We haven't had any major problems but had some issues with leaky hydraulic hoses to the front slide. HWH had a problem with some defective hoses in the early 2000s with them leaking around the metal ferrules where the fittings attach to the hoses. You'll know if you have a problem if you see drips of hydraulic fluid. Hopefully your's are OK. If you do have this problem, PM me.
We also had a leaky bathroom skylight that I had to replace and do some ceiling repairs, but this isn't unique to the 35U.
One issue to look into are windshield leaks. These can be simple or complex to fix. Use the powered by Google search box to find threads on this. Again, feel free to PM me if you have this issue.
The converter and inverter are separate. The converter should be under the stove and, if original should be replaced to one with multi-stage charging. I installed one of these:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
There's a small inverter in the cabinet to the right of the front TV.
I think the 35U is one of the best Winnebago floor plans.
Oh, and if it hasn't already been done, upgrade your toilet to a high profile one with a ceramic bowl:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
I also replaced the water pump.
If you PM me I'll give you my direct contact info.