If all of you are travelling in the tow vehicle, you will be right at your limits with most TT units in the size range you have mentioned. 1700 lb payload with 4 in the truck doesnt give you a lot to work with. Look at lightweight units for your preferences, maybe the keystone Outback293UBH. Private room with dinette and two permanent bunks as well as third for if they bring a friend. And it has the outside kitchen. Many possibilities in this size and layout, kitchen counters are limited, but the ones I mentioned had large pantry's at least.
Just pay close attention to tongue weights, remember the listed weights dont include batteries, propane, Weight distributing hitch, or water in the tanks, so allow for them on the tongue weight in addition to whatever you load in the TT.