changing tire

bbaker2001 wrote:
Having 4 new tires put on.
when they jack up 5er, should the jacks be under axle or frame
dont want to bend axle
thanks

Depends on the type of axle system on the trailer...and if they know their business.
If your trailer has a torsion type suspension then have them jack from the main frame rails.

If the trailer has the std leaf spring suspension then they may jack under the main frame rails ......or under the axle tubes next to the U bolts.....or the U bolts themselves. The industry has done this for the 55 years I've been around trucks pulling commercially ...or just a RV.
I only deal with truck tire type dealers who know how to safely jack a trailer either with a lifting beam under the axles or two big floor hyd jacks under the frame rails just aft and just fwd of the farthest spring hangers.

I would ask first how they will jack your trailer. If they've been around for years jacking trailers then they may know much more than a RV newby......which we all were at one time.