I have tried filling it to the top before, actually, I've done 2 Bobloads in it! It usually squishes everything down to about 2/3 full when there is a HUGE load in it. I have yet to try a Bobload in it with my new water trick. I tried out the Clean Washer cycle to see what it would do and it fills all the way to the rim of he tub with HOT water! So it's not like it won't fill up a ton. I just wonder what it will do with a Bobload and my new water cheat... I'll be sure to take a video of that!
Also, even without the water cheat, both Bobloads came out flawlessly. No more stains (they were nasty loads), nothing tangled, and everything soft and fresh smelling! I did have to split the loads between 2 dryers each though...