Recommended Truck Modifications/Addons

Good set of floormats. I like Weathertech, but there are several good brands available.

Running boards or nerf bars if it's 4x4 and doesn't come with them. N-Fab was the brand I went with

Seat covers

Aux fuel tank so you won't be at the mercy of having to pay higher prices in a Podunk town. I'm a month into owning a diesel and I'm more acutely aware of prices now. With gas, there wasn't as big of a price difference of buying along a major highway vs a few blocks into town, but I have noticed with diesel that the HIGHEST places, sometimes up to .30 cents/gallon are along the major roads

Neither one is needed on todays new trucks.
I've bought new trucks and put them in commercial service pulling heavy GN trailers. Just a tow package/OEM locking diff.

I never add anything till I drive it for a time....then decide whats needed.

Buy the 2500. Get a 3500 SRW if you think you will ever want a much larger camper. Any modern truck set up for towing from the factory will be far and away better equipped than a truck from 20 years ago. In my opinion, set up from the factory would include:
tow package, tow mirrors, built in trailer brake control, provisions for a 5th wheel hitch if you ever want one, dual alternators if you plan a big battery bank for camping without hook-ups, long bed, dual tanks if available, lower axle gears, limited slip or locking rear axle, whatever tires and wheels offer the highest axle weight ratings. This last one might mean skipping the bling wheels for real truck wheels.

If you are considering a preluber for making you engine last longer, I would consider an oil bypass filter instead (assuming you will get the hemi). You will always have clean oil, and will save money on oil changes along the way.

I always get a tonneau cover and a Bedrug mat, but that is based on how I use my truck. Get the 2500, it sounds like a trailer is in your future. Welcome to the forum.

The only thing I would add to a new truck is an auxiliary fuel tank. Like everyone else has stated, buy enough truck and skip the two you are talking about.

Get a Ford F150 with the 3.5 EcoBoost and the Max Tow package. That should cover everything you need for a 7,000 lb TT.

I haven't heard anyone mention a preluber in a long time. I wouldn't add anything to the mechanics of the truck unless you found out you needed it first. Chances are if you buy enough truck it wont be necessary.

Wth is a preluber?

If you're buying a new truck you don't need to modify it to make it relaible, able to tow heavy or last a long time.

With a newer HD diesel pickup, it’s ready for anything that you’re likely to throw at it! memtb

My business takes me all over the country so I will be driving thru the mountains and very hot areas. From what I read a tranny cooler is a cheap insurance policy. The prelube is just something that sounded like a good idea. I have no experience with it but the concept makes sense to me.