My personal thoughts are that the trailer won't suffer any damage by storing it that way.
However, not so sure about your TV, the Excursion. You would be leaving the full tongue weight of the trailer on the suspension of the TV for all that time. I can't imagine that would do any good for the TV's suspension.
You could put the TT's tongue jack down,and release some of the weight from the Excursion, I suppose. That would mitigate the pressure on the suspension.
I would also disconnect the umbilical, to ensure no power loss on the TV's battery.
[Edit: I type too slowly!