Welcome to the forum and happy trailer shopping.
To avoid the 'overestimating' trap, you'll have do some calculating. First you'll need to find the PAYLOAD of your tow vehicle (TV). That is the weight that it can carry; all the people, dogs, etc., inside or on top of the vehicle plus the weight on the tongue of the trailer you are pulling. The tongue weight can be estimated by take the GROSS weight of the trailer and multiplying that by 0.15 (15%).
There is usually a sticker on the driver's side door frame that will have the TV payload. PAYLOAD is the amount that is usually the limiting factor - long before the towing capacity is reached. The towing capacity is the figure most RV salesmen are familiar with and will steer you to using when you are shopping for a trailer.
You'll also need to find info on your vehicle's hitch capacity (to make sure that isn't exceeded) and research weight distribution hitches (WD hitches).
Lots if this stuff is in this site. Search for keywords and happy reading! If you have questions, just ask.
(BTW, our 2015 27RLS is similar. Our old, blind Poodle needs a ramp and having 2 doors works very well for us.)
Sherm & Terry w/rescue Eydie (min Schnauzer) & Charley (std Poodle)
2015 Jay Flight 27RLS, GY Endurance (E), Days: 102 '15, 90 '16, 80 '17, 161 '18
2006 Ford F350 PSD, 4WD, CC, LB, SRW, Cmpr. pkg, Equal-i-zer 4-p, ContiTrac TR
Full timing: Some will think you're crazy, some will be envious, just enjoy the freedom!