I have a HW277...one step down from your PUP.
Aside from the double axle and a bit larger tub, our units are similar.
I would recommend against adding a rack, FRONT OR REAR, for something as heavy as a generator AND firewood.
- Rack: 50 to 100 pounds
- Frame/bumper reinforcement to support the rack: 50 to 100 pounds
- Generator with fuel/oil: 70 pounds
- Firewood 50 to 100 pounds
Let's leave out the firewood and call that 200 pounds.
Your tongue weight should be about 400...stock.
Put that on the front, above the battery/propane, and you've increased tongue weight by 50%.
Hang it off the back, and you've decreased tongue weight by MORE than 50% because of the extra structure to attach to the frame...very dangerous.
Now consider that your CCC (cargo capacity) is about 1000 to 1200 pounds, and with water, and gear...and without the extra weight of the rack, generator, and firewood...you'll typically be near your cargo capacity.
Can you manage that? Sure, but if your rig is like mine, your fresh tank is 26 gallons x 8.3 pounds per gallon = 217 pounds all by itself. A full load of gear, full propane tanks, and so on can use up the remaining capacity quickly.
My inside load is usually:
- Two flip-lid tubs of food
- Full fridge
- Cabinets packed with supplies
- Shower packed with sundries
- The factory gas grill and frame
- Charcoal grill and charcoal
- All the blankets and other bedding
- Two duffels with clothes
- Tools, hardware, flashlights, lanterns, bear spray, batteries, and, and, and ....hell, my 18 volt cordless drill weighs a couple pounds.
In short...800 to 1000 pounds goes fast, and I doubt that using 10% of the rig's CCC for a rack will buy you any advantage...except exterior storage for the fuel-laden generator.
In my TV, I have the generator, firewood, camp chairs, two big coolers, 4 Reliance 7 Gallon Water Jugs, a spare propane tank, a propane fire pit.
Juggle that as you will, you don't have 100 to 200 pounds of CCC to spare on a rack. If your TV is an SUV or similarly enclosed vehicle (not a pickup), throw the generator and GOOD fuel can inside the door of the PUP, and anchor it with some stout bungees to eye-bolts you add. The PUP will air out during setup. If you plan well, the generator will fit in the dinette slide under the collapsed table. Add a throw rug under the generator and fuel can to protect the floor and a rubber strip on the "walls" to protect them.