I installed a linear actuator on my bed in our 2BHS. The bed has the regular mattress and a 4" foam pad (or what ever they call them. I have no issues, it has been working since February of 2016 and is used on a daily basis, as I keep all my electronics hobby stuff under it. The one I purchased has a 225Lb limit, and is mounted close to the center of the bed. It does not strain itself going up and you can tell that it is a lot easier coming down.
I purchased mine on Amazon and the switch is a 3 position, up/off/down and it automatically turns off when either end is reached, which is a GREAT feature.
I also put a piece of metal about 12"x24" (it will need some type of support under the board) on the top of the bed and the actuator is bolted to it from the bottom. I also put a 1/4 inch x 2" x 5' aluminum strip on one of the 1x1 wood supports glued to the bottom of the bed board.
Leave the 2 side lift supports connected as they keep the bed level while going up and down.
Make sure you remove the pillows from the head of the bed before raising it.
I mounted the switch on the side of the bed stand, out of the way.
DW thinks it is the greatest upgrade that I have done so far.
2013 Jayco Eagle 284BHS
250Watt Grape Solar Panel, MorningStar MPPT 60 Charge Controller
1500 Watt Ramsond PSI, 2 Trojan T145 Batteries (260Ah)
2 - AirSight Wireless IP Cameras (used as rear view cameras)
EnGenius WI-FI extender, D-Link wireless (n) modem
MagicJack Internet Phone
2012 Ford F150XLT, EcoBoost w/3.73
157" Wheel base, HD Towing Package
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