We have the Load Max made by Load Trail. Bought it from Illinois Trailer Sales in Monticello, IL. We'd buy the same trailer again if needed, and from the same dealer. Both have been good.

It looks like it would take a phone call to the mfg (Contact Us) to get your specific question answered. I don't know the answer on how many lbs you can leave parked on the hydraulic dove tail. Here's link to Load Trail. Again, you want the Load Max series:

http://loadtrail.com/index.php/trailers/heavy-duty-goosenecks-pintle-hooks/