how wide can camper jacks be ?

That's interesting that either of your options are technically over-wide for use on US highways. I wouldn't think they could get by making their product that way. A camper lift is certainly not "safety equipment" and shouldn't exceed 102". There are some roadways, particularly in the east, that have a maximum width of 96" I haven't seen much enforcement of it. Many trailers are 102" wide and travel them regularly.

I should have stated I'm installing a Stable Lift so no swing out brackets. The predrilled holes allow 104 " or 106 ". I can get by with 104 " but it is " snug " passing by the fenders the 106 " leaves some wiggle room. I'll have to see how each width matches up with my camper as I am replacing conventional lift jacks ( wobbly******).

Why leave the jacks out that far, get dually swing outs for your jacks. When you have it on the truck they swing in close to the truck but when you unload they swing out to give the width you need to clear a dually.

8.5' is the max width you are supposed to be except for safety equipment, like mirrors and such. I know they put stuff further out like MHs that are 8.5' wide and then they have awnings on them also. There are some states that allow 9' width but not all.

I think your mirrors may be wider than that... but not sure if they have an exception as opposed to something more solid like a jack.