A lot of things I could offer for advice, but if it was me, I would prioritize what is most important and let your other decisions emanate from there, and try not to let emotions interfere with making sound decisions. So, if a large trailer and "living space" is your priority, then get that trailer and choose a TV that will tow it properly. If it takes a US make vehicle to do so, then I would make that a priority over an emotional distaste for US vehicles. Emotion is all that is, since many US vehicles are very good these days, and only a few foreign makes can tow big stuff as well. FWIW, I have a 2002 Yukon XL with 140K on it that has only let me down once (fuel pump at 70k miles) and is now towing a 30 foot trailer. Just do your research.
I would also not buy any of your stuff new. While guys like me who only by used stuff love people who insist on new (because you create a robust used market for us in a few years), buying new would be a waste of money if you are selling in 6 months. You'll take a huge loss on the trailer, and unless you keep the TV, another loss on that too. Combined, the money you lose could buy you a nice used trailer. Don't let your emotions guide you too much. I would get a large SUV or truck, possibly still under warranty or get a short term extended aftermarket warranty, and use that to tow your large trailer (because I think that's where you're headed).
Finally, I am not sure how old the baby is or what your dog is like, but my baby rode in the back in a child seat (forward and rearward facing), with a happy black Lab for a number of years. The dog might have licked the kid's face a couple times. What is the big deal there? If you need a truck, get one, and stick a large object between the kid and the dog on the back seat. (Also, consider a full size van).
Hope I've given you something useful to consider, but have fun whatever you decide.
Andre