TCs sight has a few Tundra pics.
TC and Camburg are the only pre fabbed LT kits at this time. ESB is working on a kit but is not currently available. Their Tacoma kit is already in production, using uniballs top AND bottom, 5.5" wider per side, plate lower arms, square tubing uppers, steering, plus a piece for the rack.
www.esbfabrications.com
I too have often wondered about using 62s on the back. I measured a Tundra a year ago before i even had mine and it seemed to be 61" eye to eye. So if the 62s made for the Tacoma and mini Toyota have the correct axle placement they could possibly be a bolt in. ON my 94 Toyota 2wd, i cut the spring mounts off, welded on new hangers in the correct spot, and made my own shackles and shackle mounts. Tundra have their springs on the outside of the frame rails rather than under like Tacos and minis, so its a lilttle different setup.
As far as bolt in for sure options. I talked to a guy running the replacement Deavers and he said they rode great. There is also a budget option called the 3 leaf addition. You ditch your stock overload and install 3 thin leaves to make it a progressive ride.