IMO, sounds good at first glance, but maybe,,, not.
Diffidently already have a filter/strainer in the pump, and maybe also one in the nozzle depending on what nozzle you have.
Adding an external filter assembly, lower than the tank, with additional fuel fittings/connections exposed under your toy Hauler, although a small possibility if done right, it still is a possible hazard from leaking/siphoning fuel from a damaged filter or its connections.
To me, already having a screen/filter in the pump, and knowing clean fuel only is carefully put in the TH fuel tank,makes an additional redundant fuel system modification a possibly dangerous not so good an idea imo.
Not to say one couldn't install a filter in the system, in a protected area, with all the correct fittings/hoses/connections/mounts/etc..., just is it really needed...?
Why is the pump being changed, whats wrong with it...?
Never seen any bike, quad, SxS, jetski, sled, etc... that didn't have some type of mesh filter screen on the fuel pickup or fuel petcock, or in the the fuel pump on some of the efi engines.
I use this 'Mr. Funnel' that separates out water and debris when I think its needed.
jmo
