Almost all the sumos purchased by the police detorirated very quickly and most of them are not in running condition anymore if I'm not mistaken. Since 32 sri Landcruisers and 61- pajeros are still running it can't only be the poor maintenance. Just consider that as well before buying. Mahindra Bolero and Scopian is also another option but not sure whether it falls within your budget.
If you're so keen on sumo try police auction. you might be able to get it cheap and restore.