another tire and wheel question?

[MONSTERMATT]

if i get the helo maxx 8 with 4 and a half inch backspacing in size 17x9 can i run them with the stock bfg all terrains? and if i want to run 37x13.50r17 in the grappler or another tire will these rims still work with that kind of backspacing? i asked the tire dealer for this specific backspacing and he asked me- "why, do u want them to stick out or something? come to think of it i like the wide stance look but will those options mentioned above both work?