Well Toyota solid axles are pretty tough. A lot of guys on here run 40" tires on their toyota axles. Since your front axle is the same as ours you can upgrade to Longfields (
http://www.longfieldsuperaxles.com/) which are super beefy versions of the birfield joint. You can use offset rims and small wheel spacers (NO more than 2") to get some extra width. As for coils I dont know much about coil suspensions but I would imagine lifting it even further would cause you to have to change all your coils and toyota links to aftermarket or custom longer ones.
What is your wheelbase??
