I don’t think financing his campaign is going to be an issue. Trump has significant stature and credit to probably walk into a bank and get a several hundred million dollar signature loan or more and walk out with the money the same day.
During his rally in Delaware he said he had 365 (or there abouts...check the rally for exact number) of companies registered there....and in an earlier speech said he was owner or partner in over 700 companies world wide.