We probably have owned our Voyage longer than most, but has anyone else had to have their swim ladder welded because of rust?

We have had ours rewelded twice. First when it was but maybe 4 years old; the repair held up better, now at 19 years old.

Sea water, probably, rather than rain, gets inside the tubing, which must be the cause.

I plan to drill some holes to let it drain when raised, but has anyone else experienced this?