They are fairly equivalent, but Jayco seems to have a slightly better quality reputation (whether deserved or not, I can't say). I think the Tundra can have about 2000 lbs payload, "when properly equipped," but you do need to check this. On hitch weight, keep in mind that advertised dry hitch weight is usually without LP tanks, battery, etc. And then you add water... where is the fresh water tank, up front? 38 gallons is 300 lbs. Even without water in the tanks, once you load up your gear and stuff you can figure the hitch weight will probably be somewhere between 800 and 1100 lbs. As mentioned already, you have to add in the weight of your weight-distributing hitch (I suggest the Equal-i-zer brand with 4-point sway control built in). Do the math for your truck.
Personally, I started with a 23' TT and then downsized to the 16'-17' range (kids are grown and moved out). It is just more pleasant IMO to tow a smaller trailer, and I can get into the small campsites in national forest CGs.