Looking for pattern - Vertical Double Gun Rack

[TARNATION !!!]

Hello gents: This year I plan to spend several consecutive days in the field and intend to take our small motorhome. I would like to build a rack to accommodate at least 3 Parkers and two back-ups (Winchester 1200 and SKB XL900) The game will be to take some pheasant and eat a few on the road and come home with a possession limit. Not my normal routine but mother convinced me that I should accompany her on a cruise that will see me miss the last half of the early season and some of the late. She has put up with me for 40 hunting seasons now so I guess she deserves a break for the 41st. Anyway, I digress. Back to a pattern.

Does anyone have material suggestions to ensure that road vibration will not be a factor for the butt-stock and the muzzle end of the barrels. The guns will be cased for the start and end drive, but I was thinking a rack might be handy while wandering through my favorite haunts.

Thanks for any hints.

Regards,
Jack