WE NEED A STICKY! Ron and others have patiently recited the story time and again. I believe his alignment required "offset bushings" like this

to get the caster/camber within spec when the chassis is pretty much fully loaded all the time with the weight of the coach body.
Look at the pic and you'll see the center hole isn't centered on the outside shell. OEM bushings are centered. The pic is from INGALLS, who also offers adjustable offset bushings, and for not much more money. I pictured the non adjustable just for simplicity of explanation. I would actually buy their 59400 adjustable bushings. gOOgle that and you'll see a photo also.
As Ron says, get it aligned as loaded for travel. And as Harvard (who's put lots of thought and effort into alignment) says, have the CASTER set toward the HIGH end of the Positive Range, not the middle as most shops will do.
When I added the Hellwig rear sway bar, then the Blue Ox (same as Henderson) track bar, I was concerned about the install of the track bar. Suggestion I got was "Be sure it's against the Cross Member." That member is the one between Axle and Fuel Tank. As I recall, the frame rail (driver side, where the upper end of the Track Bar attaches) is not completely straight, flat, something like that. To get it to the crossmember, I had to drive it with a hand sledge. Doing that got it maybe 1/4" and surely less than 1/2" closer. I did not have any interference issues with the Blue Ox track and the Hellwig sway bars, as delivered. No special order parts.
We have an OP here who installed a track bar and had interference with the rear cover on his differential. He took it off and didn't sound like he planned to reinstall. Would probably like to sell it. We never got into details about the install or how the problem showed itself.
My guess, and only a guess, you won't have interference. But I was doing the "early" E-450.