Others can speak of things specific to the 19RR. However when you search the forums note that the 19RR, 21RR, 22RR, 25RR, 26RR, & 27RR are very similar. The one difference is that the 26RR & the new 22RR have the main bed lengthwise whereas the others have it tucked across the trailer. But the lift up of the bed to access the storage is similar.
I used the idea of another owner and made some wooden struts to hold it up. Still a little awkward but cheap. You can also get gas struts but that costs more and you have to work out what strength to get. My workmanship is not great but functional. It still a little awkward to get up and down but at least they hold it up there. I fold the bedspread back up ove to get it out of the way when doing this and also hold the mattress when I let it down. I have also smoothed the bed base wood corners and edges as they tore the mattress once.
With your skills and machinery and tools you will certainly make a much better system.
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Toyota Tundra towing 2016 Grey Wolf 26RR
24 nights camping & 1450 miles so far (August 17)