It sounds like you are looking for stabilizer jacks for your 2018 Forest River Shockwave travel trailer. Landing gear is something you would typically find on a 5th wheel. If you are looking for some manual jacks for the rear then I recommend the Ultra-Fab Ultra Scissor Jacks # UF48-979002.
If you're looking for electric stabilizers then I recommend the Lippert High-Speed Power Stabilizer Jack - White Switch Kit - 30" Lift # LC369774. This features legs that extend up to 30" for quick... view full answer...