IMO the amount of good that a tripod will do depends on the height and weight. They do okay with smaller, lighter 5th wheels, but don't seem to do much with taller, heavier ones.
My advice is to put the money toward something like JT Strongarms instead of the tripod.
The JT Strongarms come with self-tapping bolts so you don't really have to drill holes first. I have the I-beam frame and used the self-tapping screws in a couple places where I couldn't get to the bolts to put nuts on. They seemed to work well so that would be an option for you.