Only counting the air conditioner draw. You will be suprised how much other things add up.
Do you ever use the microwave?
So sure, if both compressors happen to be active at the moment (not just the blowers) AND you turn on a powerful appliance like the microwave, then you can throw a 30 amp breaker. But given the expense of upgrading to a 50 amp setup, the compromise of having to reach over and turn off (or even just turn up the thermostat briefly so it stops the compressor) on one AC unit for a couple minutes while you cook something in the microwave is so minor as to be inconsequential.
If you were clever, you could wire a current sensor to the microwave that would automatically kick off the backup AC unit whenever it was activated.
Are you on a 50amp service? if not, 30 amp may not run both AC units.
If the sum of the AC unit current demands exceed 30, but that doesn't happen very often. My 15K ac unit only measured 13.2 amps draw max. So though it MAY not run both, it PROBABLY will.
Some of these new MHs are selling for $70,000. If I bought a new PU that would pull a 5Ver I would be looking at over $50,000 plus then the cost of the 5Ver.
The what if game is fun. If you bought a new PU you'd also be a fool with more money than sense. :D
On the other hand, if you bought my 2003 F350 Crew Cab Dually Diesel 4x4 for $15K (cash and its yours) and spent another $20K on a very nice aluminium roofed 24' twin slide fifth wheel, you'd have yourself on the road well equipped for only $35K.
Which is at least twice as good as 70K, I'm fairly sure.
cost too much to drive it all the time...
It occurs to me that you could put it up on blocks. That *is* the traditional way of 'storing' a vehicle - remove the tires and put them somewhere where they won't decay so quickly, perhaps in a dark plastic bag at the least, or indoors somewhere. Sure you have to reattach them when you want to use the truck, but at least you preserve your investment in tires...