sliding door roller cassette

A quick learner from Fall City, Washington says:
June 4, 2011
I have an RV with a metal sliding door with roller cassettes that are shot. I've looked around your site and found that my Del Mar toronto cassette most closely approximates your mirror door roller #23-198. Dimensions and shape are very close. However, my cassette has metal wheels. This is an exterior door. What would you suggest?

I would appreciate your comments. Thank you,

Gary D.
User submitted photo of RV metal sliding cassette roller.
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Dave Sr. from SWISCO responded:
June 6, 2011
Yes, the 23-198 looks like it could work in your door. However check the dimensions on the web site against the dimensions of your roller.
A quick learner says:
June 6, 2011
How about the nylon vs metal wheels. This is a heavy door.
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Dave Sr. from SWISCO responded:
June 13, 2011
I think a metal roller would work better with your application. However, spray it with a silicone-based spray before installation- this should help prevent corrosion.
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