Frame id help

[DOUGIEB59]

HI FELLAS,,
IM ON A NEW QUEST... I FOUND THESE NUMBERS ON THE DRIVERS SIDE FRAME RAIL OF MY BEAST, IM TOLD IT HAS A SUBURBAN FRAME AND RUNNING GEAR. BUT IT WOULD BE NICE IF I KNEW WHAT IT REALLY IS. PARTS SURE WOULD BE ALOT EASIER.
THE NUMBERS ARE "14000251" AND "9072" DIRECTLY UNDERNEITH IT???
ANY IDEAS??
THANKS, DOUG

 

[Old Iron]

I think you're missing some letters

 

[DOUGIEB59]

Thats all there are...??
D/b