I have just gone through all of this...I have a 21 foot TT that is 3500LBS dry, My H3 is an 06...Took it out this past weekend for the first time and it pulled not bad...not great, when pushing wind. The whole brick towing a brick thing. I did have a weight distribution hitch which made the whole rig feel solid. In your case, the trailer weight doesn't look bad, but I would be concerned about length...when it comes to sway. 'They' say 110 inch wheel base is good for about 20 feet then 4 inches of wheelbase for every foot over 20 feet. With the 3 being 111.9 inches I'm a bit over the 'rule of thumb'. All can I say is ... wish I had an Alpha for pulling mine!