Hi! I'm in the process of sound deadening, insulating and carpeting my T6. We are using a 'reputable' conversion specialist and they have advised me to keep the OEM spongy rubber floor in the rear without bothering to add any insulation or sound deadening underneath as it does an ok job as it is and isn't worth the extra money. Just wondering if anyone has any advice on whether its worth asking/paying to add a 2mm silent coat underneath the OEM rubber floor? Or to get rid of the OEM rubber (soft and spongy nice feel) and ply line/carpet the floor with added insulation/sound deadening underneath? I'm just a bit concerned on the amount of effect (if any) it would have on the desired 'keeps van cool in summer. warm in winter' ? We will be using it to sleep in as a multipurpose conversion!