A possible source for alternate screens.
https://www.google.com/search?q=sink+strainer+mesh&client=firefox-b-d&sxsrf=ALeKk01XbIfK6eKMIJhvJVJEOzJgrtiLaA:1586103651504&source=lnms&tbm=isch&sa=X&ved=2ahUKEwif-eXF2NHoAhUZhXIEHUr_CGEQ_AUoAXoECA0QAw&biw=1252&bih=582
My Dollar Store has 3-packs.
Other potential leak points on any MH (including Sunraders) are clearance lights, roof racks, antennas, solar panels, etc. Of course any physical/mechanical damage.
You currently have 185/60R14 fitted? That was the standard tire size & capacity for my 1984 VW Rabbit GTI. Good luck with that!
If you want a little more (safely), install 185R14 102/100 tires and a 4.88:1 or 5.29:1 differential.
The first and last Sunraders were build in the California plant. They all had the wrap around windows. Sunrader also had a plant in Indiana and all Indiana Sunraders had the smaller windows.
I'm not enough of a Sunrader 'scholar' to be able to say if Indiana Sunraders ever had the 'updates' (Fiberglass cabinets, roof supports).
Can't say I've noticed anything 'cranky' since JD left.
With so many people stay (I hope) at home, your ISP might be overloaded and throttling back speeds?
Another source of information:-
https://www.jamestowndistributors.com/userportal/main.do
Their YouTube Channel:-
https://www.youtube.com/user/JamestownTV
For more 'structural strength', use one of their reinforced products. Less likely to crack.
https://www.3m.com/3M/en_US/company-us/all-3m-products/~/Bondo-Glass-Reinforced-Filler/?N=5002385+3293242372&preselect=8711351&rt=rud
https://www.3m.com/3M/en_US/company-us/all-3m-products/~/Bondo-Hair-Long-Strand-Fiberglass-Reinforced-Filler/?N=5002385+3293241078&preselect=8711351&rt=rud
Epoxy resin is also brittle. That's why people use it with fillers or fiberglass cloth/mat.
I'm guessing the structure of a Chevy van is a lot more rigid than are 'sheds' built up on the back of a Toyota pickup. All those rattles and squeaks are an indication of this.