I just bought a new to me 2005 Tundra DC TRD same color as yours. I'm going to do a Toytec OME lift for it at some point (or Bilstein's 6112 kit, Bilstein told me it was going to be released in April for 1st gen Tundras) and I'm trying to decide what tires. I like the idea of 255/85/16, but I want to buy 5 and that is alot of coin for tires. If you get the 235/85/16s please post pics as I'd love to see them on your truck with that lift. 235s are significantly cheaper.
I like the looks of the UTE beds. If anything ever happens to my bed, I'm going that route. After renting a P/U from Home Depot with a UTe bed type setup, I'm sold on their functionality. Plus it's a great platform for a flatbed camper from ATC or FWC.

I inquired about a UTe bed for a Tundra last year (I almost bought one that had been rear-ended) and it was $3200 + $170 for the light kit and about $400 shipping to GA. Not cheap....but few things worth having are.