Hey,

Will 355/50/20 (34x14.00r20) fit on a 2005 1500 4x4 with level kit, I know that are not as tall as 35 but they are widder. I have 20x10 wheels...

 

depends on rims offset .

 

Offset = -6mm

 

That's only a 5.25" ofset. Not a chance. 12.5" tires need a 4.5" BS to clear everything. You'll need at least a 4" BS to clear that wide of a tire. For sure that will require fender flares unless you want mud and rocks up the side of your truck.
You could buy 1.25" wheels spacers to make them fit with your current wheels.

 

That sucks...I have 33 12.50r20 on there now and still a lot of room, that's why I thought I could fit them..u think 325 60 20 would fit?

 

Measure how much room you have at full turn and how much room there is between the inner sidewall and the upper control arm. Report back with precise measurements and I can further help you.

 

would i be better jsut goin with 35x12.50 20 then?

 

you still might need spacers to clear at full turn .
do what brother dogg said measure it then post back.