Water leaks will 'KILL' an RV.
Routine maintenance is critical. Inspecting/cleaning/checking ALL systems (roof seals, slideout seals, water fittings, electrical connections, batteries etc).
You can NOT just use them, put them away and then expect them to last.
Was in CG late last year where a 5th wheel was parked as a seasonal unit. No routine maint. just use it/abuse it.
Guy came home one evening to find bedroom slide bottom had fallen out, part of bed frame/box hanging thru bottom of slide.
Complete slide out had to be removed and rebuilt along with sidewall of 5'vr.
The wood used in these rigs are like sponges when it comes to water. They will suck it up, swell up and then crumble