[QUOTE=TXSurf4;365375]As you stated, your concern about the hose pressure disguising a bad pump is true. It happens on outboards as well when people use "ear muffs" to test. Probably the reason most dealers use test tanks. With no access to unfrozen water your best bet might be to use the fake lake fill them and then just see how well they do at draining the bags. Other than that it is probably best to just buy some spare impellers and keep them in the boat with you, I always have a set of spares on hand just in case. When you get to your destination back the boat down, leave it on the trailer and test them there. If you have to replace any just pull the boat back out and swap.

Thank you for the great suggestions and comments. I will probably end up with the plan you are describing. Dealerships do have the set ups now for testing. Our nearest boat dealer is 4 hr away, and moomba/supra 5 1/2 hrs away. I think I will probably end up going for it with extra impellers.And fill them now and test the draining. Thank you for your input.