Welcome to the forum.
A lot of people take their Direct or Dish satellite systems with them when RVing.
Once you get the hang of setting them up, you could probably roll into a new place after dark, and be on the bird and watching TV in 10 minutes.
I'd say it might take you half an hour with fixed (one bird) FTA.
Setting up a motor might be a several-hour job.
And you'd want to do those in the day time.
...and that'd be after a number of successful test-runs...
I'm sure others will chime in with more or less pessimistic opinions.
For a temporary stand, you could use any of the old tried and tested ideas:
tripod, 5 gallon bucket of cement, big low-slung umbrella stand (metal disc), something home-made you could add weight to by adding water, or one of the stands you lay cement blocks on to stabilize it...
I always wondered about using a basket ball hoop/stand - do you fill them with water or sand...?
To be practical and not ridiculous , I'd guess a 30" dish might be adequate.
May as well invest in a top-end LNB (if only because it doesn't cost too much more).
As for the motor, maybe others will make a good case for one, but it seems like a lot of trouble.
Guess it depends on what you want to watch.
Other opinions welcome.