Are the dry weights the true dry weight or the website dry weight? Most TT's I looked at when buying mine, the actual empty weight on the yellow sticker on the trailer was a good bit heavier than the brochure or website listed dry weight. That yellow sticker weight (for mine anyhow) includes full propane and furnished as it left factory with all options added. It does not include any water in tanks (which I don't normally carry full tank). although the gross weight of the Jayco is more than the Rockwood, it also has more carrying capacity and likely heavier duty axles. You can always load the same 1500 lbs the Rockwood will allow you to carry, and have the spare on the Jayco. Leaving YOUR gross weight at 7000, giving you a bit of room below your max tow capacity.
FYI, I pull my JayFlight with a yellow sticker weight of 5202 with my 2010 F150 5.0 without any issues. Now if I am going up and down steep hills, I can tell it, but I am not an experience mountain/hill driver, so would likely have the same situation not towing.
