I just purchased my new tow rig and trailer (Nissan Armada / Kiefer 18' aluminum). Sometimes I'll tow with my Motorcoach but that's got way more capacity so I made decisions based on the Armada.
https://mightytext.net/z1RIDQ <-- Image
I got this trailer because it didn't have the drop tail (full flat area to use) but did have the dropped axle to lower it to 10.5" off ground. I also got the aluminum because it only weighs slightly over 1k pounds so that leaves me with 6k capacity.
I also just bought a hitch that has a scale built in so I always know what the tongue weight is.
Weigh Safe WS4-2
https://smile.amazon.com/gp/product/B00REOYMWW/
Even though I only needed a 16' for the Cobra I went with an 18' for longer potential vehicles and if I ever wanted to bring my Harley or Golf Cart cross ways on the front with the Cobra on the trailer also. Because of this I made sure the trailer ramps would hook to the sides for side loading if necessary.
Hope that helps. Brian