Regarding the SIM sliding forward I can recommend this:Great Shout!! thanks @TheGrapeEscape
We've got a full width RIB (130cm) that we've tried many different ways of making sleeping bearable and we purchased and tried one of the Trail SIMs at the weekend.
It was very comfortableIt was great being able to move in the morning, instead of feeling like you'd slept on a pile of broken bricks!
..the only 2 (minor, unforseen) issues we now have are:
1, We lost a few cm of headroom due to the SIM thickness so no sitting up in bed (standard tin-top) - need to try it on a lower level of inflation or get a pop-top.
2, (Due to the above the headroom issue) the SIM slid forward up against the front seats as we were shuffling on/off the bed - we were on a bit of a slope which didn't help.
So, absolutely would recommend the SIM and getting a comfortable nights sleep
Fogarty Soft Touch Toggle Fitted Sheet | Dunelm
* Inviting, crisp finish * Convenient toggle fastening * Easy care * Machine Washable * Co-ordinating Items available Elevate your sleep with this expertly crafted fitted sheet by Fogarty, designed for ultimate comfort and practicality. Featuring a smooth and crisp finish, it offers a luxurious...
www.dunelm.com
We have the 113 RIB and use a 5cm SIM and the poptop foam mattress on top. This works well but we had a fitted sheet specifically for the bed so it was really difficult to put the sheet over all of it (fitted mattress protector too but this is more roomy). We just bought this sheet to replace the fitted one and it works really well, you just adjust the toggles to fit once and then it holds it all together each time it’s fitted
