The best option for electric stabilizing jacks for your motorhome are the Ultra-Fab Power Twin II Electric Stabilizer - 22" Lift # UF39-941707 which will fit if your frame is 42" to 77" wide or the Ultra-Fab Power Twin II Electric Stabilizer with Dual Motors - 30" Lift # UF39-941705 which fits motorhome frames from 48" to 80" wide.
For a tankless water heater we have solutions like the Fogatti part # LSB64FR which has a 41,800 btu output. view full answer...
I recommend the Roadmaster Rear Anti-Sway Bar, # RM-1209-131, this is a confirmed fit for the 2018 Thor Synergy Motorhome.
Please note the attached product review and installation videos. view full answer...