I take extended trips in a large RV - and want to keep using my TRX.  Does anybody make a portable suspension unit that can accomodate one person?  I have the door hook - not practical for this use.  I have a ceiling height of 7 FT - width of about 4 feet. 

How sturdy is the ladder on the end of your RV? You could also throw in a small step ladder and find a high anchor point on a nearby tree.  I bought the extension awhile back and it works great on thick tree trunks as well.  I prefer an overhead anchor point but anchoring to a tree or post works well.