congrats on joining the Roo Kroo!!!!
all the 23SS owners i know, including me, got the 1000/10000 Equal-i-zer and are happy. that 509 number is the "dry" weight and totally fictional. it's tongue heavy for its size. you do need a special socket to tighten the ball. the dealer we bought ours from set up ours for free, even though they sold Reese.
the 23SS floorplan is perfect for two people. we love ours and hope to use it well into the early stages of our retirement.
there are plenty of 23SS owners out there. be sure to post future questions on the Expandable section here at FRF.