My late Uncle Jake worked as a pipeliner in the 1950s -1960s and he
retired as a regional warehouse & equipment manager for the pipeline
company he worked his entire career for. He and his family lived in
house trailers and he pulled them from job to job until he got a 'permanent'
location at the warehouse.
He used wooden stabilizing jacks, that he made, and he placed them in front
and behind the wheels and then about every six to eight feet along the two
main house trailer chassis's longitudinal beams as well as as at the front and
rear-most spots, a few inches in. As far as I recall he used full dimension 2x4
Oak pieces. [You need a dense hardwood that will not split easily.] There was a
base piece with notches from close to its middle spaced evenly to one end
and the other end had two pieces of the Oak 2x4, that were hinged together,
hinged to it [all as shown in the Paint drawing below]. The hinges were the large
heavy duty door hinges of that era [not thin or flimsy], and they were bolted
through the Oak 2x4s, with machine bolts with beveled heads that fit into the
beveled holes in the hinges and secured with a fender type washer, a lock washer
and also double nutted. I don't know the hardware material, but knowing him
they were probably brass. [Now-a-days I'd try to use galvanized or stainless.]
He used these on the house trailers he could pull himself [up to ~ 8x35] and he
even used them on the 12x60 mobile home he ended up living in at his 'permanent'
location (!). He'd level it with a hydralic jack, then put these wooden stabilizers
under the two main chassis beams with them resting in the wide "V" made by the
hinging smaller legs [The stabilizers thus being in a perpendicular position to the
chassis beam.].
Some kind of smaller version could be made for use with the TDs and TTTs I'm
sure.
Click pic for larger view.

[Note: Drawing not to scale, and the sizes of the 2x4 pieces would need to be
made to fit your trailer and needs, ideally try to keep it so that both 'legs' are
equal when deployed.]
Cheers,
Norm/mezmo
If you have a house - you have a hobby.