UPDATE: According to a 2008 interview with “Ethan Willis from Prosper Inc.”, Prosper “co-develop[ed] curriculum with the team from Trump University”.
Also, it appears that the “Trump U Coaching” DBA was registered with the state of Utah on 09/23/2005.
By way of reference, the Trump University launch event was at Trump Tower in May 2005. At the event, Trump allegedly said:
"When I make speeches, a lot of people show up, a lot of people," Trump said at a news conference in midtown Manhattan. "There's something out there, and I thought this would be a good time to take advantage of it."