I totally agree with LJAZ, and I salute you for looking into this thoroughly! So many folks do not and we see them merrily rolling down the road unknowingly looking for an accident! And most RV sales people either have no clue about towing capabilities or are just out to 'sell' and will tell you anything.
Note that one factor you did not comment on is the GCVW , Gross COMBINED Vehicle Weight which is the Max you should be running down the road with; Then your Yukon's Max GVW, which would be your Yukon loaded plus the hitch weight. But from what you indicate, either of those trailers, even loaded with their max cargo load should be good.
For instance, fully loaded, we are at around 12,500 on our GCVW ... My RAM is rated for 14,000. But we are also boarder-line on the Max GVW for the truck because of the added tongue weight, but well under the 8,500 Trailer towing capacity, as far as the trailer's weight! Go figure. But so glad you're not trying to max it out and over load! Good RVing!