*If* Bella married Jacob how would he support her financially?
From Modern Studies Textbook, I quote: 'Many young American Indians on reservations don't graduate from high school. Unemployment rates and birth & death rates are higher then the USA average. The suicide rate is twice that of the USA as a whole.
The most common form of high pay is to open gambling casinos in states where gambling is illegal.'
Clearly in the Twilight Saga, Jacob didn't graduate from high school, he looks after his disabled father which means if he did have a chance to go to college he would have to stay behind and look after his father.
As "mechanic", there is has been no evidence he earns any money.
Also, Jacob & Bella's marriage can't be based solely on love,it's impossible as nice as that idea sounds.