low budget, trailer towing, 4X4,prefer a truck but worried about low fuel economy?
Almost Impossible for us to suggest what YOU should buy. Would have to be used and only you can find that.
You want a 4x4 truck to haul a fairly light trailer. Any 1/2ton will do. Make sure it has the bigger V8. 5.3 vs 4.8 in GM or 5.7 vs 4.7 in Dodge. Better economy with the bigger engines IMO.
But you need to forget about fuel economy. seriously it is going to suck but what can you expect
and last 5-6 years?....a used 7-10 year old truck? maybe, who knows. will likely need a bit of maintenance to do it.
Obviously do not buy a diesel