Haulmark trailers ok?

Believe the model you listed also has leaf springs. Upgrading axles to the 5200lb will most likely also upgrade to the torsion flex axles. Our old trailer had them and it was crazy how stable things were in the trailer. My new trailer I adopted from my dad has leaf springs and I'm less than impressed with that feature.

Believe back in the day the "get you in the door" ad was 3999.00 for a 24', by the time we got what we felt we needed it was around $6800.

http://www.haulinit.com/products/114-haulmark-85x24-transport-10000lb-gvwr.aspx