Tank and fifth wheel mounts

[Plink]

Hey guys, was wondering if anybody makes mounts for tanks and fifth wheels that do not bolt thru the top flange.To me that shoots the realism. When I was building trucks for a living you never ever drilled a hole in the top or bottom flange of a frame rail to mount anything if you wanted to keep your job,you fab a side mount and drilled the vertical plane of the rail. Just wonder why they don't sell they kits right from they get go or am I being pickydont be scared or just tell me to take off my glasses and I will never know