My BAL X chocks between the wheels take out about 75% of the shakes, and putting simple screw jacks under the frame just in front of and behind each wheel takes out another 20% or so. Taking out that last 5% is not worth the $$ to buy either the arms or a tripod, IMHO.
2003 Ford F-350 V-10 Crew Cab 4WD Long Bed
2004 Jayco Designer Medallion 29 RLTS 5th wheel
Bill, Gayle, and Mindi (dachshund)
Retired at last !
Nothing is foolproof to a sufficiently talented fool.