Just to give an indication of costs.... I bought my 14' Hawkline trailer a little over a year ago, with these options:
1. Spare tire & mount, which cost about $100 more
2. Set-back jack so that it doesn't interfere with tailgate of my PU, which cost $25 more
3. Custom paint color (Kubota orange instead of red or black) which cost $25 more
4. Easy-lube axles (which pumps the grease between the inner and outer wheel bearings) which cost $70 more
All total, it came to $1525 plus tax... It came standard with electric brakes on one axle. I did not buy it from the place linked above -- that's just the best picture I could find quickly on the 'net.
Here's my actual trailer, shown last year with the load I hauled back from Minnesota:
Pic 1 Pic 2
I'd taken the ramps/tailgates off, put them on the bed, and loaded tractors on top of them, to cut down on the wind resistance on this 1350 mile run...