1 ton dually & single wheel truck differences

[MercPowered]

I've been curious about this for a long time and have finally decided to ask. On occasion I've run across a dually with a nice cab but I don't want a dually. My street is too narrow and local ordanances prohibit parking I tons (duallys) on residential streets (long term). I've thought about converting a dually to a single wheel truck and dropping on a Fleetside bed but I have questions.

1. Is a dually rear narrower? Can regular 8 lug wheels be used and the lugs replaced with shorter ones or would the rear end have to be replaced?

2. I assume the spindles/drums/disks would have to be replaced to eliminate the dished wheels?

3. Are the wheel well openings larger for use with dished wheels?

4. Are there other considerations I haven't considered?

Thanks in advance for your expertise.