Look for the sticker in your door jamb that says total weight of passengers and cargo not to exceed xxxx lbs.
Googling it, I came up with 1053 lbs - yours may be different depending on options. Look at the gross weight of the TT you are considering, or add 1K to the unloaded weight, then multiply by 13% to get a good estimation of tongue weight. Subtract from payload.
Subtract weight of hith and WDH - usually 100 lbs. Then subtract your weight and weight of stuff in the TV.
A high walled TT will create wind resistance which will need to be over come by your TV. Towing capacity is really a mythical number when it comes to towing an RV.
Don't be to down on slide outs. Go into TT's with and without them and see the difference. Lots of more living room with a slide out. And yes, there are always people who report problems with them, but you can find problems with any system associated with RV's.
A popup camper made by a company called Trailmanor may be suitable for your tow vehicle - just google the name.
Good luck with your search.