JMHO, s 3/4t is fine, unless it isn't fine with you. If you are purchasing a different truck, i would go ahead with a 1T srw. I pull my 34TBOK with a F250 CC 4x4 lariat V10 & it pulls and sits great! I live in central Nebraska though, and the area is pretty flat.
If i could do it over, I'd do a 1T drw, just because used are about the same or even cheaper them a 3/4T, and nothing wrong with too much truck
Joel and Teresa
2016 Sabre 34TBOK
2006 GMC 3500 CC LB DRW 4X4