The 3100SS if a good unit but your trailer is 1500lbs over the tow limit of 5000lbs. A DP class A would suit you better since a lot of them have 10000lb tow rating. I know, I see drag racers do it all the time, but that doesn't make it safe or right. You could also look at a Super Class C like a Toterhome. That's what a friend of mine has for his SS/AH.
2012 SunSeeker 3100SS Toad-1962 Futura Average 100 + days camping