The other two should be given to everyone that visits the stall, so make sure there are plenty of copies. It is also useful to have things such as past newsletters which have write-ups of club events around. Having a TV and video player is probably more trouble than it is actually worth. Unless the set-up is particularly good, this seems to be a bit of an excess. They make a fair bit of noise, so they can actually distract from the rest of the stall.
People can just watch the TV for a while before moving on, rather than having to ask at the stall.
They are a major hassle to hire, set up, get electricity for, and take down again. There are always problems with sun reflecting off the screen and rain. It also does not seem to draw in new members as expected. Most new members seem to be attracted by other things. All in all, I feel they are not worth the investment and trouble.