Could do a deal like those "goofy" shackles" where the regular shackle is attached to a link. The link sits flat on the bottom of the frame and is pinned there for normal towing.
When you need more GC you pull the pins and inflate some air springs attached to the shackle links. Would make it more tippy when up. MISF & I solved that problem on our Cheep Trailer Project with some old un-used hard/hard valved Monroe Circle Track shocks he had laying around. Can get them from Speedway.
Alternately you could make those links a rocker arm and use a linear actuator, hyd ram, or air ram to lift it.
Could even go so far as to make the tailend of the deck lay flat on the ground with the links totally relaxed. Raise up to ride height and pin it for travel, un-pin & lift it higher for recovery use.
When you need more GC you pull the pins and inflate some air springs attached to the shackle links. Would make it more tippy when up. MISF & I solved that problem on our Cheep Trailer Project with some old un-used hard/hard valved Monroe Circle Track shocks he had laying around. Can get them from Speedway.
Alternately you could make those links a rocker arm and use a linear actuator, hyd ram, or air ram to lift it.
Could even go so far as to make the tailend of the deck lay flat on the ground with the links totally relaxed. Raise up to ride height and pin it for travel, un-pin & lift it higher for recovery use.

