Look at the GVWR on your trailer and figure 15% - 20% of that weight on the tongue. That'll give you an idea of what weight rating you need for an electric tongue jack. Someone recently posted a good price on an electric tongue jack at Costco.com. Sorry, I don't recall where it was, but I believe it was a 3,500 lbs. tongue jack???
'14 Ram 2500 MC CTD
'14 287BHBE (gone)
'16 North Point 377BHRL (current and hopefully last)