I see... so you are not using the H bridge to make Ac in the msw then.
I can see you now only must have 180 dc to play with to send down the line to the remote smps....
If this is an accurate representation of what you have to play with, then I would simply throw out the Hbridge, series the secondaries of the two transformers ( they are usually driven by a common pwm signal... so in phase), rectify and send that.
Use the series Rsense in the neg leg (higher value as current is now half .. ie cut one out), a voltage divider across the now 320vdc to get 180v to feed the pwm driver and were done.
You will then have simple rectification, and better stability, still have current control as before, and still have voltage control as before.... I have found doublers to be a much higher impedance source than I had anticipated, and lossy.
ignore scribble on extreme left ...page under neath.... curses
...
Am I understanding correctly that you just want 320vdc out of the msw?? .. if so thats the strongest lowest impedance way to do it i think.
The hesitation in the smps will be an energy storage problem...... why I don't like hf inverters to begin with....I like LF where the battery is the energy storage... but, that said, the 1/2E^2C ( energy) of the capacitor storage may need to be looked at first if you want better surge characteristics in the smps..... more caps... more storage...less ripple/cap as well ( life).... in both the msw and the smps ( assuming the fets can handle that extra umph )
It's your project though, so i will leave you alone to do as you wish... but you did ask.
Best of luck with it too... and I like your truck.
.......oztules
Ps... or you could just run the 120vac from the msw to the smps as it was designed I suppose... should not be too much loss in the Hbridge.