I have a comp box with dd3's BHAF and a 4 inch exhaust. I will see up to about 35-38 psi of boost wot. and EGT's can shoot to 1200 when on 5x5. If i turn it down I can climb hills all day long on 3x5 and never have a problem. If I am towing I usually run 1x1 or just turn the box off. Last week before my clutch problems I would see 1200 on a long hill, but most of the time on the flats I was right about 950 to 1000. Easy to back out of it when I needed to and still maintain 65mph. The trailer I would estimate around 13-15,000 range.
Hope that helps. If you need more or something different let me kow and I will try and help.
Jon