As far as strength, toy pu axles would not be near a ford 9, but I think would be way better than a d35 ttb, or a D30 SAS.
There are thousands of toyotas running around this country with 35+ tires on the stock axles, and I would bet only about 10-15% are running chromo birfs or longfields. but that is probably the more hardcore group.
The problem you might have, other than changing transfer case, is the length. You'll have to check what the length is on the toy axles cause it may be too narrow for an rbv. I know when I put some toy axles in a sidekick, they were actually about 1-1/2" narrower than the stock "kick axles were.
You might be able to get away with it with some wheel spacers, but I personally wouldn't go that route cause the turning radius would probably suck.
You could probably sell those toy axles cause toyata guys are just as crazy about doing SAS's as we are, then get at least a D44