We just replaced out topper last Saturday with one from Tough Tops
. It took my wife and I about an hour including taking the old one out, I pulled from the top of the slide while she guided it in. Noticeably heavier fabric than original and well made.
No affiliation other than a happy customer.
The above post is just my experience/opinion which is worth exactly what you paid for it.
'05 Lance 845/'06 F-250 or '99 Alpine 36SDS Usually towing an '01 Wrangler locked on 35"s or moderate '98 Cherokee on 33"s (rear locker only)