When you look at listed trailer weights, you are looking at what's called "dry weight" or "unloaded vehicle weight" (UVW). Don't use them for matching up a tow vehicle.
The average travel trailer gains about 1000 lbs, between stuff added by the selling dealer, and stuff added by the end user.
The average tongue (AKA hitch) weight is 12 - 13 percent of loaded trailer weight.
The trailer you're looking at (5350 and 550 lbs) will be approximately 6400 lbs loaded, with about 800 lbs of tongue weight. Keep in mind, tongue weight is not a constant number. It goes up and down (with varying levels of groceries, water, holding tank levels) during every trip.
Your tow vehicle has numerous weight ratings to be mindful of. The main ones are payload (what is the vehicle rated carry), hitch receiver weight (with and without WD hitch), and tow capacity. Normally, you will run out of available payload, before you get close to your advertised "max tow capacity".
Payload is used up by weight of aftermarket accessories added to the truck, people, pets, cargo (in the truck), weight distributing hitch, and trailer tongue weight.
Here's a link to an online calculator. You can put in your numbers and it will tell you your max trailer weight.