Karen,
WE set the tent up as close to the trailer as we can get it. In some csmpgrounds that we've been, it can hard to find a sight that will fit the TD with the tent that has 10x10 foot print. Anyway, after getting tent up, we use 1/4 shock cord attached to the tube opening to pull it tight to the side and top of the TD. It works great for us. It took some trial and error to get the cord lengths just right, but after the adjustments were good, I put small metal hooks on the ends for clipping to the TD.
We like the extra living space. We set our porta pottie in the tent for use at night. We have a couple of camp chairs and a small table that will fit in, that we use if the weather turns bad and we need to get in out of the weather to eat or just sit and read or play cards.

It's very nice to be able climb out in the morning and stand up and get dressed. We also carry a small electric heater and have used it to heat the tent durring cool periods. The 1500W heaters keeps it nice and toasty.
If you look in our personal picture gallery you will find several pics of our TD with the tent set up. There is one view taken of the inside of the tent. We set the tent on the right side of the TD. Guess who sleeps on that side.
Jim