What's a good car to sleep in for under $5000?

I'm going on a long trip across America and need a car with lots of room to sleep in during it.

Currently I own a Honda Civic which is obviously not very roomy but uncomfortable.

So which car under $5000 is a good car for this long trip?

Did I damage my car by forgetting the emergency brake was on while backing up?

Yesterday I was backing out of a parking spot that was in a slight inclune. The car backed up a bit but there was a car coming so I stopped. Once the car passed I continued to step on the gas to reverse but the car wouldn't move. I took my foot off and pushed it again. Maybe did this two more times before I realized my emergency brake was on. My question is did I damage anything by doing this? I have an automatic transmission and the car is a 08 Honda Civic hybrid.

Do I get new tires and how many?

I have a 2006 Honda Civic with three tires I feel need to be replaced, but one that is still good on tread. The readings are 3/32, 3/32, 4/32, and 7/32. The less worn tire is newer, and by the manufacture date, appears to have been put on the vehicle right before I purchased the car used in 2013. The three lowest ones all have a leak that costs ~10 psi a week so I'm constantly having to fill them, and they are the worst tire I have ever used, thus I want to replace them. Is it recommended to replace all four tires to match, or just the three bad ones?

Also, if I were to consider selling the vehicle soon, should I even bother to replace the tires? Will it affect how much I can get for the vehicle if it has fresh tires rather than old tires? I don't exactly want to spend $500 on new tires if the vehicle can be sold for the same with or without new tires.

Is it safe to tow 1500 lbs trailer on a 2009 Honda Civic LX?

We're travelling to NY from FL trip during new year and all my family are going to live there. Renting 5 x 8 cargo trailer from uhaul while the empty weigh 900 lbs.

We have 5 people, our 2 puppy, luggage in the trunk and roof rack. And last bunch of family items in the trailer.

Added (1). Btw, I forgot to mention to add more details that pulling 1500 lbs on trailer isn't that heavy to me like I could move my hands. I know this exceeds weight on 1k lb limit, and I want to know if this is safe or not even if is overloaded. Because I know the people who overload their car and successfully made it to their trip.

Honda civic 2000 Turn Signal?

I have a honda civic 2000 DX. I currently am replacing my headlights from stock ones to all clears. What bulb is needed for a turning signal? Do they make led amber bulbs?