Sending you ideas in TX and NM from 3k-8k...seems like the 1 ton vans w a class 5 hitch might be where there are a few deals, but not much great out there w gooseneck or 5th w. Including the mech specials just in case.  -Joel

Here are some ideas for you on vehicles in TX and then further down NM.  I think 1-ton vans might be the only route for a good price, but I don't know what they can really haul as a 3500 series van.

1 ton Chev van 3500, 350, towing package, $3800

https://austin.craigslist.org/cto/d/austin-2002-chevrolet-expeess-v8/7637792689.html

1 ton Chev van 3500, 350, towing package

https://dallas.craigslist.org/ftw/cto/d/fort-worth-1998-gmc-savana-3500/7642014522.html

1982 dually 454 gas, Austin

https://austin.craigslist.org/cto/d/georgetown-gmc/7634512026.html

Looks like a good deal for a dually

https://austin.craigslist.org/cto/d/austin-2004-ford-f350-dually-2wd-long/7635944184.html

97 Ford dually, East of Dallas

https://easttexas.craigslist.org/cto/d/longview-1997-f350-powerstroke/7634701066.html

Cheap, but runs, diesel

https://houston.craigslist.org/cto/d/houston-2001-ford/7640841408.html

No one likes the 6.0, but neighbor likes his

https://mcallen.craigslist.org/cto/d/edinburg-2004-ford-350/7637974839.html

https://austin.craigslist.org/cto/d/cedar-park-1989-f350-dually/7638424475.html

https://dallas.craigslist.org/ftw/ctd/d/fort-worth-dodge-ram-2500-club-cab/7635573407.html

https://sanantonio.craigslist.org/cto/d/boerne-2006-chevy-silverado-2500-hd/7636918625.html

No clear price, trans trouble

https://austin.craigslist.org/cto/d/cedar-park-2001-ford-f350-knapheide/7640910711.html

More rough

https://corpuschristi.craigslist.org/cto/d/refugio-2006-ford-need-it-gone-dont/7643323312.html

https://austin.craigslist.org/cto/d/austin-2002-ford-350/7640949415.html

v10 stops running

https://austin.craigslist.org/cto/d/leander-2008-f350-4x4-crew-cab-dually/7640173913.html

No title

https://victoriatx.craigslist.org/cto/d/victoria-2000-chevy-ton/7639173139.html

Why so cheap?https://sanantonio.craigslist.org/cto/d/new-braunfels-2015-dodge-ram-3500/7643032315.html

Prob underpowered and pricey

https://houston.craigslist.org/cto/d/houston-2002-ford-e350-super-duty-van/7634624820.html

New Mexico

Best one I've seen for the price in Abq, might need hitch work

https://albuquerque.craigslist.org/cto/d/albuquerque-1995-chevy-c3500/7632796899.html

Old, but could be good for a low price

https://albuquerque.craigslist.org/cto/d/albuquerque-1990-ford-f450-super-duty/7642973114.html

F550, mech special

https://albuquerque.craigslist.org/cto/d/albuquerque-2008-f550-diesel-single-cab/7640924111.html

Pricey, but a diesel dually

https://santafe.craigslist.org/cto/d/santa-fe-ford-350/7640270279.html

Mobile repair hauler?

https://albuquerque.craigslist.org/cto/d/las-vegas-1999-ford-f350-box-truck/7635473609.html

Mech special

https://roswell.craigslist.org/cto/d/mayhill-99-x4/7640107649.html

Pricey for the miles

https://albuquerque.craigslist.org/cto/d/placitas-2003-f350/7638380158.html

2500 trucks

https://albuquerque.craigslist.org/cto/d/belen-2001-silverado-2500hd/7642447646.html

Pricey for 6.0, but 4x4

https://albuquerque.craigslist.org/cto/d/albuquerque-hd/7642211211.html

Cracked tailshaft on trans, but still drives

https://albuquerque.craigslist.org/cto/d/corrales-2003-gmc-2500hd-duramax/7642568736.html

Mystery truck

https://albuquerque.craigslist.org/cto/d/albuquerque-2007-dodge-wd/7634719905.html

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Thank you, Joel