I have had to deal with slide floor rot on my 2004 T310SR. In my case I only had floor rot on one end and I created a splice in the floor in Dec 2009/spring 2010 and a method of encasing the floor screw holes along with a drip edge which caused the problem in the first place. This slide is still working well yet today.
This post shows the repair with pics and details. http://www.sunlineclub.com/forums/f7...age-10695.html
This follow on post may help as well. http://www.sunlineclub.com/forums/f7...eck-11086.html
To your question on removing the slide, two years ago I was prepared to totally remove the slide from the camper to address a main frame issue. I have seen slide removals done before and each was slightly different depending on what lifting equipment was available. If you have a forklift with a left to right sliding forks, that creates one method.
In my case I was going to use a 2 1/2 ton pallet dolly. I have a barn with a even concrete floor that would allow the pallet dolly to lift and pull out the slide. Granted you have to create a spacer to bridge the gap from the pallet dolly to the slide floor, in my case I have large oak wooden bins that would space it up.
Pulling the slide from the camper means you have to remove the slide room inside slide flanges OR the camper slide flanges on the ends and the roof line. This is not an impossible task but a task yet to itself. And then you have to re-install them.
That said, I found a U tube video at the time on how to remove the entire slide floor and leave the slide in the camper. The idea is somewhat simple. You need to remove the outside slide room flange corners (the ones attached to the actual slideroom, not the camper) and then using heavy screws, screw on 2 x 4 legs to the slide room to support it. Then you can unbolt the rack and pinion slide arms under the slide, unscrew the floor and pull it out.
I tried to find that video and cannot find the exact one. That was about 8 years ago and since there are a lot of U tubes on slide floor repair. While they are not of your Sunline, they can give you ideas. But I found one showing the temporary legs on the side of the slide. This may help give you some ideas to work off of. Looking at the mechanics, they appear to be the same guys of the video I could not find.
They had 2 parts to the video. Here is the 1st
I believe your 317SR has a dinette booth which is screwed in from the outside walls. That means you need to take the siding off to get to the screws on the dinette.
I have had several Sunlines apart in the model year vintage of yours and I'm sure I have pics of most of what you might need or close enough to explain the point. Let me know if you need more on this.
We have had other club members go through slide floor rot repair also. Some have pics of it here on the forum.
Hope this helps.
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
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