Jayco jay feather X23B

I am new to the forum, new to towing, and new to travel trailers. I found the quick reply button (that’s a start). I don’t want to buy a trailer that I will be missrible pulling. The specs for tow capacity is 6500Lbs. The trailers max weight (not dry) is 4989Lbs. I am being told from the salesperson that I will be fine pulling it (yes I am aware he is trying to sell me a trailer), with the weight distribution hitch, and break controller and being 1000lbs. under capacity. I want to be able to pull it safely and comfortable. Everything says it will do the job, but it’s not like I can hook up and take it for a test drive. I am trying to ensure I don’t make a $15000 mistake.