The one major matter of critical safety is the load bearing snap break/strength of any straps that are securing any garage mounted motorbike or scooter in place as well as of course the tie down points that of course MUST be attached to the chassis when talking about coachbuilt motorhomes and suitably load bearing points when discussing a PVC.
Over the years I have seen some ludicrously weak, madly dangerous tie down installations using things like weak/cheap bungi straps attached to hooks that have just been screwed into a piece of wood!
Phil
I was crawling around underneath my motorhome yesterday afternoon and I was struck by the difference in appearance of the metal chassis parts that was original and the metalwork such as the various straps and clips and what have you that get added for the various pipework, cable hangers, etc either for the vehicle or as part of the motorhome side of the construction.
I don't think any of those parts get any kind of rust prevention treatment! (and it is not just Fiat or Autotrail which are like this. it is industry standard across all commercial vehicles whether used as originally intended, as a base for a Motorhome or converted as a PVC.)
Anyways, as this is motorhomeBUILDER, someone may come across this thread when looking for ways to add tie-down points, so something which can work very well and is very flexible is the UNWIN rail system, very commonly used for minibus and wheelchair seating but more uses than just that!
Example and a supplier of the rail -
https://www.johnadamssupplies.co.uk/shop/unwin-rail/unwin-surface-rail/
This can be fitted to the floor or to the sides, and you can get accessories such as cargo rings to position anywhere in the rail, so put them right where you need them!
I use this system in my Camper to secure the water carriers in place but it is available in the whole length of the "garage" under the bed to tie anything down.