well location for wheeling with this is out west rock crawling. and i want to run 39 inch tires so will the yotas hold up to 39's? ive read that 35's are about max with the toy axles.

Yota's with after market shafts will hold up to 38 and 39 in tires without an issue.  Especially with a vehicle as light as a Sammy.  There are quite a few Toyota guys running 37" tires with stock Toy running gear underneath them.  Any axle can be built to handle pretty large tires, it just depends on how much you want to spend.  Your probably looking at 1500+ per axle to run 39" tires no matter what you choose.

For crawling out here I wouldn't recommend going full width.  There have only been a few obstacles that I have looked at and said "I wish I was a bit wider" on.  That includes Moab, all over Washington, and Johnson Valley.  Couldn't tell you about Oregon though, never ran any trails in Oregon. 

but around here finding full good toyota axles is like a "needle in a haystack" and when you do find them there expensive and still stock. were dana 44's are easy to find stock, and ones that are already built up.

is there any places you couldnt go because full width axles were too wide?

I agree, the west coast has been chewing up all the available Toy's for a while.  You could go with FJ axles...

Toyota Axle Width
    *  '79-85 front axle~ 55.5", rear axle~ 55"
    * '86-95 front IFS~ 59", rear axle~ 58.5"

With a full width axle you are looking at 65" or greater.  Stock Sammy I think is only 53".  So add a foot to the width of your vehicle.  Then the extra width from your tires, so tack another 6-12" on there and figure you will be close to 2' wider when all is said and done.  Take a picture of your rig with a ruler on each side of the tire and decide if that is where you want to be.  If it is, cool.  If not, smaller axles. 

I know some of Oregon is limited to short wheelbase only.  I'm not sure about California but I know there has been talk to putting a maximum width on some trails to slow down damage.  Someone else might know more about restrictions.  I know you will have some problems tree dodging in tight areas.

that would be crazy it would be like a giant go cart but cooler!    ill take a look at it though see if id like it or not

thanks

Robbie