PERFECT!!! I love that Tram 3500!
after your sure the antenna works well for you in that location... put the coax down into the bed... in the corner of the bed is a plastic drain cover drill out a 3/4" hole through the cover....and buy a few 3/4" grommets from Amazon .... then go in your cab and find a reference point make sure you can drill through the cab and run the coax permanently.
after you drill the hole make sure you paint both sides so it wont rust... I also put silicone the holes to keep out water and to keep the coax from moving.
I bought these Grommets ... not sure if I used a 1 inch hole... you can figure out the size of the hole... but I kind of think it was 3/4 inch