1. Most use a small 2 step ladder that folds up that can be bought from Camping World. There are also scissor steps that have 4 steps to them that make getting into the camper easier. The scissors are expensive ($250 - 300) but are nice. They attach to a bracket hung below the camper door. Fold them up and put them inside and away you go.
2. Look up Kodachrome's postings on this forum for a very clever idea for a shower curtain. Basically he used the rack on top of his Bobcat and built a U shaped copper tubing affair that slides into the rack from the side as a curtain rod.
3. Got nothing special. Ours is full of dog.
4. I haven't found anything I consider inexpensive. Harbor Freight is running a special on a 45 watt system with charger for around $200 - $250, but that is as good as I have seen. I would want to eyeball this thing in person before spending.
5. The best way to find air pressure for the bags is to inflate until you are level on the camper floor with the camper pretty well loaded as you want for your trip. Before upgrading springs, I found about 50# on the Tacoma worked, but that was after doing the level bit. An alternative is to install Timbrens as Mtn High has done. He has a Tundra and posted on his suspension mods. There is a thread on 'bags or springs' that might be helpful.
Thanks, Argonaut.
I have a small ladder and we may use that for now. I had thought of building a shower curtain similar to what you describe, and may go back to that idea. In the meantime, the shower-curtain rod may be me. Also, thanks for the tip about the air bags. I've been running 50-55 lbs., and it seems OK; just didn't have anything but guesswork to go on. I'll try the levelling thing.