I really thing people make waaaaay too much out of this issue. I have bursitis (along with the associated arthritis and tendonitis) in my right shoulder; its not bad but some days it bothers me more than others, sitting in the plane all day actually makes it feel worse than loading bags. Bring some mortin.
I think the Ultra may be one of the worse airplanes to load, but it is really not that difficult. You can have the line guys load for you, but I rarely do since I want to make sure stuff is secure. I still tip the guys a few bucks for helping out, and yes tips are reimbursable. The worst loads are six ladies on a shop X, six quail hunters, or 4 golfers. Sometimes its like a puzzle to get everything in but most times its very easy.
If you do a search, you'll find there is no typical day. Most days it seems like half the flights are repos (no pax), some days there are pax on ever leg. Most loads w/ pax are 2-3 pax w/ 1 suitcase to load per pax.
Put your app in and best of luck.