That might be tough, the legalese for warranties will usually have stated weight limits well below the actual capability of the bike, since lawyers have to be overly-cautious, and they have to allow for intended rough usage (jumps, drops, curbs, etc). Even Worksman industrial cycles (known for being the strongest bicycles that can be bought) state in the fine print of
their user manual a total weight limit of 350
Others may have helpful information here, but as far as I know, at a weight of 385, even though you might have worries going in about breakage and warranty support, your best option might be to just take a chance. If you poke around this Clyde&Athena forum, you will read about many many 'super-clydes' 400 and up, who are doing just fine on regular mountain bikes. (Like SarahBeth's report of a 400lb rider riding that Spesh stepthrough daily and not gentle, even though well above the stated weight limit).