Have three vista view windows in my 78 sovereign
that were in same condition as yours when I bought my trailer in 2000. heavily siliconed on outside and insulation between window and cover. Removed silicone and used parbond to reseal outside. AFTER MUCH DELIBERATION I decided I would try what was suggested by someone on another list. I drilled a hole in the inside glass and broke it out with a ball peen hammer.
Removed all traces of the inside glass and put in a 3/8 or 1/2 window foam chalking that I covered with glazing compound.
Removall of inside glass allowed clean of flakes from window tinting and gave me a clear window!
My windows leaked But I didn't have water in between glass!!