Tex, I built my own trailer drawer slides. Similar to what was mentioned before.....I used shelf brackets (90' angle brackets), with 1x4 between them. I put 2 on each side of the trailer, so the drawer is between them.(one upside down if you will) I used a piece of 1/4" plywood as the 'shelf' with some 2x4 aroudn the perimeter to stiffen it up. Wax the 1x4's and it'll slide easily. I put some markings on the shelf so i dont pull it out too far and have it fall out! with that being said, it easily comes out to use the trailer for bikes, snowmobiles, etc.
My trailer is a 5x8 V-nose.