What type of trawler?
In general, getting a 38' trawler for much less than $30k means that it is well into the project boat space. A lot of money can hide in a lot of places....bottom paint, running gear, shafts, engine coolers and exhausts, decks, windows, etc.
As a general rule of thumb, the only boats that are a bargain are the ones that meet your needs.
If you want a project boat because you like working on boats (or think you will), the $15k boat may be just for you. And, in that case, a "cruise ready" boat may be doubly bad for you -- too expensive and no fun.
If you want to get out on the water and start to cruise the coast, the "project boat" may be doubly bad for you'll end up working on it rather than cruising and, eventually, probably end up paying folks to work on it to get things done faster or that you don't want to do -- in which case it'll rapidly cost more than the "cruise ready" boat you could have bought.
Occasionally, health issues or someone's passing or some life event force a boat onto the market well below its normal listing price. But, these usually come with some element of risk. People often see their health and boat use, and with it boat maintenance, decline over time. Those selling estates don't know the boat. The upshot is that one boat being sold this way may be well maintained until recently and another may have been rotting for a while. And, the brightwork (varnish) doesn't always tell that story.
Maybe COVID-19 is scaring some folks into selling cheap right now. But, so far, when I look at the adverts, price seem stable and most people seem to be holding out. It isn't legal for brokers to show boats in many places now, anyway.
So, what to say? Maybe you got lucky and circumstances will allow you to get a good boat cheap. But, at least under normal circumstances, those bargains are somewhat rare and hard to validate.
If, upon first look, it seems like a bargain to you, that's great -- get a good survey and mechanical inspection. Then, and only then, will you know what you are looking at.
Don't avoid doing the inspection and survey because the boat is inexpensive to buy. That isn't the number you care about. What you want the surveyor and inspector to tell you is how much (time and.or money) it will cost to fix it.
A 38' single screw boat could, at a feasible extreme, legitimately, cost $100,000+ to restore. $2k/prop. $2k/shaft, $15k engine overhaul, $12k decks, $3k steering, $3k brightwork, $7.5k engine peripheral components and install. $5k electrical, $3k plumbing, $5k electronics, $35k house and hull paint, $3k swim step, $4k ground tackle and gear, $10k interior, $1k safety gear, $4k appliances and fixtures, etc
I don't want to scare you. I just want to make sure you work with a surveyor and inspector to give you an estimate of the "final package price" before you buy.