Just wanted to thank this thread for the advice on who to call and what to buy - I went went with the Lomax from Luke
@truckalter as well and can attest to the snow load claims. There was a dusting of snow that made its way in at the tailgate (that's not a very tight seal).
As to the talk about scratches above - I can say the fold over of the 1st two sections over the 3rd has to be done carefully. There are these aluminum channel 'stand offs' created with some seemingly scrap rubber seal which aren't covered fully. It's my one complaint with Lomax and consider it a design/qc flaw. It scratched the vinyl 'landing pad' stickers that exist on the 3rd section.
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