My husband and I don't have much money, but my wonderful husband is very handy. He bought a 2 horse bumper pull trailer (no ramp) and fixed it up for us. Where I live a rusted out, nasty, tiny horse trailer normally goes for $1,500. We got ours significantly cheaper than that (if that tells you the shape it was in).
Our maiden voyage with the newly fixed up trailer was to the barn to test whether Ava approved of our efforts. An hour and a half later, Ava's verdict was a definite No. We slunk home in a disappointed fog of defeat.
This morning I got up blurry eye'd and fed Ava her breakfast in the trailer. Mmmm... Yummy! She put both front feet in and even attempted a back foot, but wasn't quite comfortable enough to set it in the trailer yet. All in all, a very good session. I'll keep feeding her in it, progressively moving her food forward until she's standing entirely in the trailer. Then I'll work on closing doors around her while she eats and getting her comfortable with being locked in while eating.