Scott, you have already gotten some good advice but this will be a very personal decision. Find a trailer that you like and don't let others tell you you have to have this or you have to have that.
1. As far as a truck goes, I would stick with what you have unless you have made up your mind on a very large trailer. Towing capacity usually means little, it is the payload capacity that you need to concentrate on. Again, if you plan to get a big trailer you will need to rethink your tow vehicle.
2. Use the GVWR to estimate the weight. Tongue weight will effect your payload and this can be difficult to estimate.
3. It is not the antenna, it is the actual television. If you purchase an old trailer the tv might not be digital. You need a digital these days to get digital stations which carry hd programming.
4. If this is a big issue, for around $20 you can get an inline filter that attaches to the hose before the trailer.
5. The only people who "need" a 50 amp are those with large trailers with two ac units. Most trailers are internally fused at 30 amps. You can hook up to a 50 amp service without any problems but if you start drawing lots of current your main fuse will blow above 30 amps. Running the ac, heating something in the microwave and running a hair dryer all at the same time will overload most trailers regardless if you are hooked to 30 or 50.
6. If you have never had a trailer and you really aren't sure about what you want it might be best if you buy used. Keep it for awhile until you decide what you really want and then sell it, and go look for your dream,either new or used. If you buy something used make sure you look over it closely and get someone in the know to go with you. Lots of units out there with leaky roofs and other internal problems.
