Plastic Drain Line Size for Bighorn

[Piperflyer]

I want to modify the drain line on my 3760 EL Bighorn and get it away from the left front tire in case it ever blew.
The markings are off my drain lines and I am not sure of the sizes.
I believe the larger is 4" and the smaller is 1-1/4", but not sure.
I would like to have the sizes with me when I go to the hardware store, so I only buy the right parts once.
Any help is appreciated

View attachment 57078

 

[esscobra]

I am interested in seeing what you do- didn't get much past brief thought but would also like to move connection more forward and free up that area for more storage

 

[rjr6150]

3” ABS DWV for the larger line and 1 1\2” for the smaller one.