in a 14 inch tire the solution is pretty easy .
the heaviest load rating capacity i have found is 2271 # rating in a load range D .
Size is 205R14. 106 mph rated . Load Range D
there are only a couple of manufacturers with this size .
see link :
http://www.tirerack.com/tires/tires.jsp?tireMake=Kumho&tireModel=Radial+857&sidewall=Blackwall&partnum=0R4857&tab=Specs
I recently ordered tires from tire rack on monday and they were delivered to my local tire shop on wednesday .
tire rack has a list of tire shops on their site that are in your local community .
there are several posters that have these particular tires and upgraded from an 1760 # or 1820 # rating to the 2271 # rated tires .
That is the most sure fire solution , to upgrade to a quantifiable weight rating rather than depending upon brand .