I am fearing that lowering it now may lead to the top material cracking and other bad things. I have previously applied armor-all to the top annually. Anybody have any recommendations to apply some type of lotion or conditioner to keep it supple, flexible, etc. so I can lower it occasionally?

Thinking about 303 aerospace protectant, but wanted to consult the T community first. From their ad:
"The 303 UV Protectant for Vinyl, Rubber, Plastic, Tires and Leather offers industrial-strength quality that was originally engineered for aerospace and aviation applications. This product features a premium surface treatment that quickly beautifies and provides protection against harmful UV rays that can cause discoloration, fading, embrittlement, cracking and/or chalking. It also works to repel dust, dirt, lint, soiling, staining, water spots, saltwater and mildew. The 32-fl oz UV protectant spray helps restore lost color and luster to keep treated surfaces looking like new. It is safe and effective for vinyl, clear vinyl, gel-coat, fiberglass, carbon fiber, synthetic/natural rubber, plastics and finished leather.
303 UV Protectant for Vinyl, Rubber, Plastic, Tires and Leather:
Originally engineered for aerospace and aviation applications
303 aerospace protectant also repels dust, dirt, lint, soiling, staining, water spots, saltwater and mildew
Matte finish with no oily and greasy residue
Keeps treated surfaces looking new
Prevents fading and cracking
Restores lost color and luster
UV protectant spray instantly beautifies and provides superior protection against the suns harmful rays
Safe and effective for vinyl, clear vinyl, gel-coat, fiberglass, carbon fiber, synthetic/natural rubber, plastics and finished leather"