The Mayor of Vancouver currently earns 171k annual - that appears to be enough for about 7 hummers, 4 after taxes[1]. Purchasing two hummers would cost you about 50k which is a very nice nest egg to have in the bank but, considering they may get a lot of use, probably not unreasonable. Most reservations have extremely poor roads and these cars might be shared in the community - I don't know if that's the specific case here but it's pretty common... lastly, cars aren't cheap and while hummers are expensive cars they aren't unreasonably priced, maybe having a hummer is this chief's personal luxury - we all want to have nice things, even when our lives aren't glamorous.
I think that the Mayor of Vancouver's salary is pretty fair considering the job they're doing, I can't speak on the specifics of this village but I am extremely suspicious of anyone who demands that people live in visible poverty to receive aide. The concept of "the welfare queen" originated with Reagan and was entirely born to utilize as a political tool - we can stop playing into stereotypes.
1. I am 100% not a car person - if anyone else knows a better assumed value than 24k please feel free to revise or correct numbers