welcome to the site. I looked for 2 years to find the right truck to buy. found a 94 with only 107K on the clock Cummins six cyl and it runs like new.
If you really look around you find what you want for for a real good price.
my budget is 5% of yours. so far I am on target. Truck $2500, box $1500, fridge and microwave 350 (those are new),windows (4)bought on ebay $150,.....
A build thread is here:
ARROC • View topic - The Monster tow rig,...or the Motorhome with a garage