If I were going to full time, it would be a 34' for me. I had a 99 Excella 30' and liked it, but the extra 4' of living space and the dinette really makes a difference. Also the rear queen gives a pretty good size storage basement under the bed.
I have not weighed my 34' but GVWR is 9,800. Tongue should be ~1,100.
I remember correctly the 30' GVWR was 8,300 with a tongue weight of ~950 when loaded.
2014 Silverado 1500 5.3L maximum trailering package (yes, I'm towing the 34')