Mega sh 2500 hemi how much can I tow comfortably

I towed my Catalina fb223 dry weight 4,400 lbs. fully loaded I'm guessing 6,400 lbs plus 3 people in truck 3 dogs 3 kayaks and a generator in the bed with kayaks. I towed it with ease to Florida down through Tennessee. Destin Florida was the destination. Average 10 mpg. The 2 trailers in looking at are coachmen 5,500 dry weight and a Salem 6,400 dry. The more I've been hearing the more I'm thinking about the lighter trailer.