Where the heck would you start? How would you assess in order to determine how much needs done. I'm just overwhelmed, like I am at the start of every major project (and I always get over it) but this is a completely new type of project for me. I guess I really mean, how would YOU start?
You start by making a list of "everything" you find wrong.
Then the second step is to price it out, so that you will have some idea of what you would obligate yourself to.
Then...............decide if you want to tackle the project, or not.
Some TT's look okay, but won't be worth the trouble.
Choose a single system and price every single item within it. Matters not whether it is water or gas plumbing (plus appliances) or other. Every item with no exceptions.
This is the literal nuts&bolts as one learns (sometimes the hard way) that it is not the big stuff that is the problem (the appliance, for example), but all the rest of the components of that system which are at the heart of determining whether a TT is worth re-building.
The cheapest TT can [will] turn out to be the one that is most expensive. (And this is before we consider the amount of time).
The TT in best original condiion is generally the one worth owning (as all of them at Year 20 or older need some amount of R&R).
Andy's advice is really solid. Look, before you leap.
1990 35' Silver Streak Sterling
; 9k GVWR.
2004 DODGE Cummins 305/555; 6-manual; 9k GVWR.
Hensley Arrow. 10-cpm solo, 18-cpm towing
Sold: Silver Streak Model 3411