fatehunter1972 wrote:...I have a utility trailer with a steel frame but it has a 3500 lb drop axle with 15" tires...
...A problem with a 3500 lb axle is that it is way too stiff for the light weight of a TT and it will be very bouncy.
I assume that this is a drop-beam axle with leaf springs. If so, you can replace the spring packs with ones having fewer leaves, to suit the lighter load. You could also disassemble the original packs and reassemble without the shortest leaves, but new springs are so cheap it probably makes more sense to buy shiny new springs and recycle the rusty old ones.
My (not tiny) travel trailer has 5-leaf springs, good for 3500 lb on a Dexter-type (D35) drop axle. The axle and spring supplier who built it provided load ratings for the spring packs, which basically amount to 700 lb per leaf (total of the two sides), so 2100 lb capacity would mean three leaves (just the five-leaf pack without the two shortest ones).