This just popped up in my mailbox. Sounds like it might be a secondary service like Pirateship, but via Jensen USA Anybody done a shipment lately where they still have weights and dimensions so a comparison could be done?

previously they used On-Trac for shipping and this might be quite variable.
the warehouse is in Corona Ca as I recall

Nice find! I just checked their rates and compared to Pirateship and Parcelmonkey:
For shipping a 40"X24"X8" 30lb box from 95035 to 10001 (San Jose to NYC) ,
Jenson $44.46
Pirateship $73.66
Parcelmonkey $67.66

For a 60"x25"x10" 40lb box going the same way:
Jenson $90.96
Pirateship $111.78
Parcelmonkey $111.78

I am comparing the lowest priced ground shipping.
So Jenson shipping really saves over the usual discount shippers! This is a pretty dang awesome find!

Thanks for doing the legwork. Might try them for my next shipment

For anyone interested I just shipped a fellow C&V enthusiast an assortment of parts using this service and paid about $5 less than the cheapest PirateShip rate.