ABS vs PVC DWV plumbing

I am renovating an 14 ft 1968 Chateau TT. Probably had copper in it but that was poorly replaced with PVC. I have removed all the PVC and will be replacing it with PEX. After looking at all the posts and doing a little research of my own, it looks like that is the best bet. It should be easier to install and will last longer.

BTW. It anybody out there has any info on old Chateau trailer, please share. I am most interested to know what make and model the original furnace and fridge were.

Thanks