They'd sell like crazy, once the market was educated to them. These trucks are incredibly durable and reliable--There's a reason all those Canadian mines import those suckers the way they do.
Part of the problem with the US market is that the Japanese executives at a lot of the manufacturers are convinced that they know the market, and that the market is fat, happy, and more concerned about luxury bling than long-term durability. If the idjits at DOT and the EPA hadn't have distorted the market the way they started back in the 1970s with the CAFE, odds are that we'd still have the big solid sedans and station wagons that our grandparents were buying from the 1940s on. Unfortunately, they thought that they could mandate everyone going into smaller cars, and there's a certain market segment that just can't, or won't--Which is why everyone shifted into the truck/SUV market, and started demanding they be fitted out like the big cars they could no longer buy. Which is also why the Japanese are convinced that the market over here would never buy the 90-series Land Cruisers--They're flat-out work trucks built for durability with only a nod to comfort.
It's a lot like the deal with the four-door Frontier and Tacoma--For years and years, the US-native executives at Nissan and Toyota were telling the Japanese execs back in Japan that they could sell the same four-door trucks that were all over the Third World in the US, but the Japanese were convinced that they'd never sell well enough in the US market to justify bringing them in. Cue Carlos Ghosn taking over Nissan, and somewhere in there that decision got either ignored or reversed; the stories vary. Shortly after the four-door Frontier started selling so hard that they couldn't keep them on the lot, Toyota got the four-door pickup truck religion, too.
I think the Land Cruiser and the Nissan Patrol in their non-luxury boat versions would sell reasonably well, here in the US--I mean, why the hell would you spend all the money rebuilding an old truck to SFA and all the rest for off-roading, when you could go down to Toyota and plunk down the money for something like the truck on this Craigslist ad? There's a reason these things are the support vehicles for things like the Dakar Rally, and that set of reasons would likely sell them to similarly-inclined US drivers as well.