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Old 01-12-2019, 09:08 AM   #1
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King size bed

We have a 2018 Montana 3811ms 5th wheel equiped with a King size bed. The mattress extends over the pedestal about 8-10" makeing the useable portion significantly smaller. The mattress bends down if you are close to the edge. Not only is it uncomfortable but I'm sure it will ruin the mattress over time. Has anyone else noticed this or have this issue. Its like they just threw a King size mattress on a queen size bed.
Thanks in advance for any input..
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Old 01-12-2019, 10:09 AM   #2
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replace the plywood under the mattress. I did this when up sizing from a queen to king.
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Old 01-12-2019, 10:50 AM   #3
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replace the plywood under the mattress. I did this when up sizing from a queen to king.
I wasn't sure if would work well. The mattress in 11.5" wider the the frame (all on 1 side). I would guess 3/4 in plywood would be strong enough to support the mattress and a person near the edge of the bed?
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Old 01-12-2019, 11:02 AM   #4
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Just make sure that when slides are in that everything clears the wider/longer platform. Nothing like the CRUNCH sound when opening and closing slides.
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Old 01-12-2019, 11:54 AM   #5
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Just make sure that when slides are in that everything clears the wider/longer platform. Nothing like the CRUNCH sound when opening and closing slides.
I hear ya. Our bedroom side includes the bathroom so the only place to hit would be the foot of the bed and the mattress is fine there. I'm guessing 3/4 or 5/8 plywood. I think Lowe's or Home Depot will cut them to the proper size for me . Its just going to be more difficult to lift up the front section of the bed to get stuff in and out.
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Old 01-12-2019, 12:36 PM   #6
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On our 5er the bedroom has an ďRVĒ King which is about 6Ē narrower than standard king. The platform covers the width but does not go the full length of bed. It makes it difficult to set an end of bed. Additionally my DW left a suitcase at the end of the bed last time we moved. I had her get everything ready and retract slides. As I was doing a final walk around I noticed the bedroom slide lack about 2Ē fully retracting. I thought she just didnít hold button in long enough. I used the app on my phone and retracted all the way. When we unpacked at next location it was obvious the suitcase caught on the ledge of opposing slide as the hard suitcase was kinked and the long part of bed foundation had bowed. I then made a mental note if slide doesnít fully retract itís probably worth going inside and checking things out. Thankfully no serious damage.
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Old 01-13-2019, 11:18 AM   #7
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I used 15/32( 1/2 inch) supports just fine- I weigh 250 lbs
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Old 01-20-2019, 12:49 AM   #8
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Problem solved. I went to Lowe's and picked up 2 pieces of 3/4" plywood which they cut to the dimensions I gave them. Now the bed is awesome with no more mattress sagging.
Thanks for all the info..
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