I also used Visions 19.5s on my SRW. I got them at Les Scwab. Keep in mind that not all tire dealers can mount 19.5s.
I used Hankook DH-01s. I do think the Bridgestone fronts on my F-450 don’t track as much even though the Hankooks have better traction. You don’t really need the 19.5s on the front although they won’t hurt. It made quite a difference on my SRW, but the ride was quite a bit stiffer.
The size and brand/model cause 19.5s to vary a lot in weight capacity. I ran Gs. Ricksons site still has the best chart of capacity/size. There are also a few 18” tires that have over 4000 lb weight capacity. That’s probably worth a consideration as well. Note: if you don’t air the tires to max, you don’t get the maximum capacity either.
On my F-450, I run Fs which still have plenty of capacity since I have 4 tires in rear. I’m not really sure how much softer they are, but my intent was to split the difference between Es and Gs.