STEPSIDES & 20S - help?$#%

[nosto]

Ok, I know, I've been warned by XXL and other stepsiders with bigger wheels that I would have a problem with getting something to fit, especially on the rear.

Rant mode: ON
But this is pathetic. Went to 2 local 'custom' tire shops. Waited over two weeks for them to get back to me with the results of their "research". Got nothing from one guy, the other offered a wheel style that looked like it should be a ceiling fan. He said it was the only one that would fit on my truck. BULLS#$%

From seeing picts on the board, I KNOW that's not true, it looks to me like they were just lazy and really didn't want $2000+ in business.

What peeves me is that I went to each place with 4 different picts of the wheels I wanted, vendor name, style, etc and gave them the truck mod info, and even brought them the truck so they could measure if needed. They didn't even bother, just asked what tire height I wanted.
Rant mode: OFF

So, I looks like I may be flying solo (meaning ordering online and take my chances) on this and that's why I'm asking the Board folks, especially anyone with a lowered STEPSIDE on bigger wheels(pref. 18" or 20") for help.

I'm just looking for your wheel/tire sizes, and manufacturer, or even ones you've seen at shows, etc could help. Pics would help, too.

I'd prefer 20", but 18" would be OK (and I could use the extra $$$$ I save for paint!). Last time I checked, there was 11 1/2" from bedside to inner lip of the fender, measured at the axle.
NO, I don't want to tub it

I know I'll be limited to 245 or 255 width in the rear, maybe 29-30" tall. I'm currently running on 235/75X15 {28 1/2" tall) and even with the 3.07 rear, the truck still moves OK. (It had 255/60X15" (10 1/4" tread) when I got it, and that's wide enough for me).

Main concern, besides getting the backspace right, is sidewall height. Yeah, I've seen the Xtreme ones with like 275/30 or 35, but with a daily driver, I really want, hmmmm, around 4 1/2" or greater sidewall, I guess. I don't really like that 'rubber band' look anyhow.

Thanks for your help,

Oh, BTW: this is one I'm considering: Niche Britaine