The $5 fee on CL is just for vehicles, as I recall. The Trailer section is still FULL of scammers in my area. Who's dumb enough to believe a 6x10 fully enclosed Wells Fargo trailer in like new condition is selling for $800?? Lord only knows what all the scammers are trying to get? email addresses? The world at large really needs to crack down on scammers.
I tried Let Go on the phone for a while. Not a lot of quality responses to things I had for sale, but I did find a few gems to buy. In the end I dropped it because of the low response rate.
For vehicles I still use Cycle/Auto/Truck Trader, CarGurus for autos and CL. There is a BuySellTrade site locally, but they only allow 3 ads unless you pay a monthly fee, and I don't sell enough for that to cost out. Ebay works ok for me for selling and buying and I've done enough to have a good rating as a seller and am set up for it well. It's sometimes just a pain to do everything to get it completely ready to ship before you put it on ebay. And more often than I'd like, it's just not worth it to see on ebay because the shipping costs too much.
Cheap USPS is a thing of the past, and they lose too much these days so they can pad their profits by selling the "lost" items. They made $11 Million last year selling undeliverable items. And only had a 3% rate of sending things to the original shipper or recipient once it was "lost". Too often I've had packages take weeks to get from FL to MS or go far out of the way for a short distance item. MS to MN, then back to TN? WTF? The USPS needs a huge fire lit under it and the current head booted into jail for screwing up what worked better before he came on board as an appointee. Sorry for the rant.