As you become more familiar with your unit, you will find little things that need fixing or adjusting. Apparently, the reason for not installing toilet paper holders is that people like them placed in different locations --- "customer preference" -- was the term used in our case.
We have made some changes to our unit with the cupboards by installing additional shelving in the the vanity/mirror, in the large cupboard next to the fridge and wine bottle holders in the two small entertainment cupboards.
Having the kitchen - and dishes - in the rear has the potential problem of having them come flying out of their cupboards while travelling over a rough and bumpy road where the rear gets bounced around. A variety of solutions exist but we have found that placing a pillow of the right size in the cupboard where our plates, bowls, glasses, etc., are stored helps prevent this from happening. It happened once and broke a few.
Any other things that we have done that you might be interested in.....you can send a PM to me or search this forum under Modifications and Upgrades.
2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax