I've been thinking of putting an aluminum truck bed on my 2005 Toyota Tacoma. No particular reason except more room in the back (flat bed, no wheel well humps) and maybe a little lighter than the factory bed. Anyone with experience or opinions on pros and cons would be appreciated.

I have one on my ford 1 ton I've had it for about 5yrs i use a lot for packing 2 atv's on some pretty rough logging roads no problems. I had to make some wideners to haul snowmobiles.
mine is an austrailian made called a UTE tray

Jordan, 2 questions:
1. How do you like your Tacoma?
2. Are there suppliers of these Al beds here in the US? One sees them all over in Australia but I've not seen any stateside.

Cliff:

I like my Tacoma alot. It gets pretty good fuel economy. If I nurse it and keep it under 65, I can get 21-22 mpg. I put a K&N filter on it, upgraded the front suspension with an adjustable shock (increased ride height by 1.8") and put a helper spring on the rear suspension.

Did you lift it in any other way, other than the adjustable shocks & helper springs? Do you haul loads in it and that prompted you to upgrade the suspension?

Cliff:

I did not do a body or suspension lift---just the adjustable front struts (which are capable of adding 2.0" of height) and the rear helpers.
The reason for the lift was as follows: I wanted a little more hauling capacity in the rear and with the helpers installed, the rear end is about 1.50" higher than previously. So, I needed to bump the front up a bit also to maintain a level appearance as between front and rear.

The aluminium trays are extremely common here, very popular with farmers and tradesmen.

Only downsides that I can see is that drop sides can rattle like a bitch on a rough or gravel road after a few years of use when things start to loosen up a bit.
And also the floor level of the tray is somewhat higher off the ground than the standard tub with the wheel arches in it.
Not too bad if you're only loading hay or other lightweight items but makes it more difficult for loading firewood or motorcycles etc.

try www.uteltd.com/ there are dealers in the US. mine has plastic bushings on the drop sides it dosen't rattle the deck height isn't much different height than my stock ford box
for loadig atv's and snowmobiles use trifold ramps