bumper pull travel trailer with generator prep/ecnlosure?

Nash makes them and possibly Outdoors RV.

Outdoors builds a rear bumper rack heavy enough that is specifically for a genny, and has a locking mechanism to secure it. it carries it over the bumper instead of off a receiver to cut down on bounce.

My Bigfoot 27 ft travel trailer has a built in Onan 2500 but it's a 2000 model. Not sure if the new ones have the option.

Edit , I just checked all new Bigfoot size trailers have generator option.

Looks like outdoors just has a small shelf on the back for a small generator.

Nash is cool, but it's an LP generator.

I'm looking for something I can fit an Onan 4.0 on board and maybe have a 20-40 gallon tank on board for longer trips. What I would like to get away from is having to carry gas cans and fill the generator often. The Wolf Pack has this, but we don't really need a toy hauler.

Yeah I think they all are going to be propane. Artic fox has 3.6 kw gen onan gen option. I think if you custom build from the sheet they may add a fuel tank for ya...

But if you have 30 lb LP bottles on the front the onans use .5 gph @ 50% load.

If you did run something 50% load ( I doubt) all day you can run 28 hours.

Id rather have a clean burning propane gen before gasoline...

What are you trying to run?

I use a 1100 watt inverter and plug the camper to it. It poweres all I need. Coffee maker, tv's toaster oven... Refridge if needed... etc..

Just no microwave, a/c, and HWH... We dont use micro anyway, a/c not needed, and HWH runs on gas, as well s refridge...Plus I have an oven...

The Onan 3.6 LP uses .6 gallons of LP per hr at half load.
The Onan 4.0 Gas uses .5 gallons of gas per hr at half load.
The gas generator is also $500 cheaper.
On 2 x 30# LP tanks, you could run 28 hours, but then it's a challenge to find a place to fill them. And that is assuming you run nothing else off gas. Realistically it's more like 20-24 hours.

On a 30 gallon gas tank like the Wolf Pack has, you could run 60 hours and fill up at any gas station or with a couple 5 gallon gas cans you can top off occasionally.

So the gas is more efficient and cheaper, and produces more power.

We have 2 large dogs and we live in the southeast where it is regularly above 90F in the summer. We need the a/c to keep the dogs cool, and us!

We would like to be able to boondock for a weekend at times in the summer, so we need full power for up to 48-72 hours.

Most bumper pull trailers with gasoline gennys are toy haulers.

My TH has an Onan 4.0 generator and a 40gal gas tank. For a TT, I sure wouldn't buy an Onan.
I'd buy a Honda or Yamaha 3.0 or so and mount it in the pickup with a 15 or 20 gallon gas tank to avoid lifting.
Easiest option is a built-in propane generator for a TT.