I don't have a redwood, but an Alfa Gold, GVW is 16,400# and that is similar to your 16,000# redwood. My drives are 6600# with 30 gal fresh water, empty holding tanks and 30gal fuel in the auxiliary fuel tank, plus full truck fuel tank and 2 people in the truck, the trailer axles were 12,500#, GCW is 23,500#, I really don't see these as SWR numbers, can it be done, sure, but I for one wouldn't be comfortable doing it, you also don't have any leeway. I see in the Redwood litature that they are using 235 80R16" LRE tires, mine has the LRG and they are not enough, run too hot. just got my 17.5" wheels, and will be getting the tires shortly. The disc brakes are a great option, wouldn't be without them. Just giving you my 2 cents.
03 Silverado cclb 3500 drw, D/A, Reese 22k hitch
07 Alfa SeeYa Gold 30RL,2 slides,power everything