Not sure just what you mean by "a tv on the entertainment stand". Does the TT already have a "stand" or is this something you will be adding yourself? Your TV will have to either be mounted or stored whenever moving. There are various mounting brackets, but most importantly, the TV has to be secured in some way when moving. I recommend you go back to your dealer (or any dealer) and look at units that have a TV already installed for ideas on what to do. The least expensive way would be to simply set the TV on the table to view and find a good place to store it when moving (beds are a common choice for this).
If your TT did not come with any kind of TV or TV antenna, you'll need something like
this Winegard to get regular TV off-air programming. This antenna includes a built-in amplifier and requires 12 VDC. It is mounted on the roof - installation directions are included. I can't help you with specifics as to mounting as you will have to decide where it would be best to mount and determine where roof ribs (rafters) and any electrical wiring might be located in order to avoid them. The antenna will have an internal control that mounts to the ceiling directly below the antenna for raising/lowering and rotating the antenna. Your TV probably has a digital tuner already, but if not, you will need a converter box as most TV broadcast is now digital. Keep in mind, many areas where one might camp don't receive usable TV signals. Some private campgrounds offer cable TV (probably additional charge) and all you would need for that is a way to connect a cable from the source into the TT and to the TV.
Another option is to use satellite (DirecTV or Dish TV) in which case you will need a satellite receiver (and account) and something like
this satellite dish or a
portable dish tripod kit. Satellite is discussed in several threads so search the forum. If you have satellite TV at home, you should be able to take your home receiver with you and not have to set up a separate account. Keep in mind satellite can be a PITA to set up. There are far more elaborate systems that will even acquire the satellite(s) automatically, but these are far more expensive and probably not something you might pursue with this particular TT.
Lastly, you can use a DVD player or VCR to watch movies or whatever and all this would take is the same thing it would take at home - plus a way to secure them when moving.
As for your TT choice, I cannot help you with that.