I would definitely be looking at a 3/4 ton or up. My preference is gas just because the cost of a diesel is usually way higher than a gas rig and repairs on a diesel can be extremely expensive.
We have three diesels in the family, all Fords. Two have the 6.0 and one has the 6.7. The 2004 6.0 that they bought new blew a head gasket at 75,000 miles last year and caused almost 10k in repair work. The 2007 was "bullet proofed" before her dad bought it but it constantly nickel and dimes him to death on everything. The 2017 has had no problems other than the "death wobble" but only gets about 10 mpg towing and the ride is horrible. It's a crew cab 4x4 with a hay bed on it with about 25,000 miles on it.
I'm not sure what $40K will buy you these days but hopefully you can find something that will work for you.
We have three diesels in the family, all Fords. Two have the 6.0 and one has the 6.7. The 2004 6.0 that they bought new blew a head gasket at 75,000 miles last year and caused almost 10k in repair work. The 2007 was "bullet proofed" before her dad bought it but it constantly nickel and dimes him to death on everything. The 2017 has had no problems other than the "death wobble" but only gets about 10 mpg towing and the ride is horrible. It's a crew cab 4x4 with a hay bed on it with about 25,000 miles on it.
I'm not sure what $40K will buy you these days but hopefully you can find something that will work for you.