I have been researching both of these (tonneaus and steps/bars) for several weeks. I am also trying to decide what to get. I tend to do a lot of searching before I make a decision, and it drives my wife crazy sometimes.
For the tonneau:
Both options you listed seem very comparable and similar price, and they both have rack options. American Roll Cover seems to be a lower profile than the Ridgelander, so I like the look of that. The Ridgelander seems to have a slightly better slot / rack system that might be a little more versatile. I haven't seen the weight/load capacity of the Ridgelander, but I know the American Roll Cover is 550lbs on top (distributed) and you can even stand/walk on top of it, which may be a nice feature especially if you have a roof-top rack or cargo tray. I think for that reason, I am leaning towards the American Roll Cover, but I haven't seen much about the Ridgelander so you've got me doing some more research on that
For the steps/bars:
I was originally looking at the N-Fab bars/steps as well. I'm still researching but I think I might fork over the extra money and get the AMP Research retractable steps. I also was looking at...
Running boards: If I was going to do this route, I was considering the Go Rhino RB20.
Rock Sliders: If you're just going for the look of the sliders and not actual sliders with full weight support, check the Tyger Star Armor or the Smittybilt M-1. The Smittybilt won't work if you have the 38-gallon fuel tank. I was about to order these until I found out about the 38-gallon tank problem. Then I was going to order the Tyger, but Amazon won't ship them to California.
Bars/Steps: I also like both options you listed, the only reason I'm not doing one of these is because I would prefer to have full length access (can stand anywhere I want) and even have a place to step closer to the bed for bed access.
Let us know which ones you go with, and post some pictures. Also, whatever you decide to get, check and see if Josh from
sells them because his discount seems to be the best pricing I've seen anywhere.